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Kurosaka C, Tagata C, Nakagawa S, Kobayashi M, Miyake S. Effects of green tea and roasted green tea on human responses. Sci Rep 2024; 14:8588. [PMID: 38615105 PMCID: PMC11016062 DOI: 10.1038/s41598-024-59383-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 04/10/2024] [Indexed: 04/15/2024] Open
Abstract
Our objective was to elucidate the effects of tea consumption on refreshment and stress reduction/recovery through examining the multiple associations among factors such as various physiological responses and task performance. Participants included 20 healthy young men who performed a mental arithmetic task while 11 physiological responses were measured. The experiments were conducted twice under different beverage consumption conditions on separate days. The mental arithmetic task was executed six times in 1 day; participants ingested hot water, green tea, or roasted green tea (hojicha) before each task. Several subjective assessments: subjective fatigue, stress, mental workload, and flow were evaluated after each task. The R-R intervals, heart rate variability spectral components, the Poincaré plot indices (SD1 and SD2) and plethysmogram amplitude tended to decrease during task periods compared to resting periods. Tissue blood volume/flow (TBV, TBF) and near-infrared spectroscopy responses (NIRS) were lower in the tea condition than in the hot water condition. By scrutinizing various indicators, we found that aromatic stimulation of Japanese tea beverages has the potential to induce positive effects, enhance mental task performance, promote refreshment, and alleviate feelings of fatigue. These positive effects were observed even in small quantities and within a short duration, mirroring responses observed in daily consumption.
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Affiliation(s)
- Chie Kurosaka
- Department of Human, Information and Life Sciences, School of Health Sciences, University of Occupational and Environmental Health, Japan, Kitakyushu, Fukuoka, Japan.
| | - Chika Tagata
- Central Research Institute, ITOEN, Ltd., Makinohara, Shizuoka, Japan
| | - Sae Nakagawa
- Central Research Institute, ITOEN, Ltd., Makinohara, Shizuoka, Japan
| | - Makoto Kobayashi
- Central Research Institute, ITOEN, Ltd., Makinohara, Shizuoka, Japan
| | - Shinji Miyake
- Graduate School of Science and Technology, Chitose Institute of Science and Technology, Chitose, Hokkaido, Japan
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Wang J, Zhang L, Wang S, Zhang L. Living arrangements, health lifestyles, and health outcomes among Chinese oldest-old. Front Public Health 2023; 11:1235768. [PMID: 37876711 PMCID: PMC10591327 DOI: 10.3389/fpubh.2023.1235768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 09/04/2023] [Indexed: 10/26/2023] Open
Abstract
Background Prior literature has documented a strong correlation between living arrangements and older adults' health outcomes. However, few studies have explained why this association exists. This study took the health lifestyle theory approach and brought health lifestyles into the link between living arrangements and Chinese oldest-old health outcomes. It examined (1) whether healthy lifestyle behaviors among the oldest-old varied by household contexts and (2) whether the health disparities among the Chinese oldest-old in different household contexts could be partially explained by their healthy lifestyles. Methods Using the most recent 2018 data released by the Chinese Longitudinal Healthy Longevity Survey (CLHLS), latent class analysis was applied to identify predominant health lifestyles among the Chinese oldest-old aged 85-105 years. Regression analyses were used to test the mediating effect of health lifestyles. Results Three distinct classes representing the health lifestyles of Chinese oldest-old emerged; health lifestyle patterns were found to vary by elders' living arrangements. The respondent's health lifestyles in diverse residential structures served as a mediator which can partially explain the health disparities among the oldest-old. Conclusion The results suggested that health lifestyles can serve as a mediator to explain the association between oldest-old living arrangement patterns and their health outcomes. The findings highlighted the importance of family, lifestyles, and cultural contexts to the health of the oldest-old.
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Affiliation(s)
- Jie Wang
- School of Law, Anhui Normal University, Wuhu, Anhui, China
| | - Lanxi Zhang
- Department of Sociology and Anthropology, School of Oriental and African Studies, University of London, London, United Kingdom
| | - Shen Wang
- School of International Relations, Beijing International Studies University, Beijing, China
| | - Li Zhang
- School of Sociology, China University of Political Science and Law, Beijing, China
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3
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Abtan J, Ducrocq G, Elbez Y, Ferrari R, Ford I, Fox KM, Tardif JC, Tendera M, Danchin N, Parkhomenko A, Reid CM, Gabriel Steg P. Association between coffee or tea consumption and cardiovascular outcomes in patients with stable coronary artery disease: Analysis from the CLARIFY registry. Arch Cardiovasc Dis 2023; 116:382-389. [PMID: 37524628 DOI: 10.1016/j.acvd.2023.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 05/23/2023] [Accepted: 05/25/2023] [Indexed: 08/02/2023]
Abstract
BACKGROUND Conflicting data exist on the association between consumption of coffee or tea and cardiovascular outcomes, and few focus on patients with established coronary artery disease. AIM To describe the association between coffee or tea consumption and cardiovascular outcomes in patients with stable coronary artery disease, using an extensive contemporary international registry, allowing the identification of multiple potential confounders. METHODS The Prospective Observational Longitudinal Registry of Patients With Stable Coronary Artery Disease (CLARIFY) registry enrolled in 2009 and 2010 in 45 countries, with a 5-year follow-up. Patients were categorized according to daily consumption of coffee or tea, and were compared with those declaring neither. The primary composite outcome of myocardial infarction, stroke or cardiovascular death was analysed at 5years, as well as all-cause mortality. Sensitivity analyses were performed with a multivariable model. RESULTS A total of 15,459 and 10,029 patients declared coffee or tea consumption, respectively. At 5years, after full adjustment, no association was found between coffee consumption and the primary outcome: hazard ratio 1.04 (95% confidence interval 0.89-1.21) for 1 cup; 0.94 (0.82-1.08) for 2-3 cups; and 1.04 (0.86-1.27) for ≥4 cups (P=0.51). Drinking tea was not associated with a different incidence of the primary outcome before or after adjustment, with fully adjusted hazard ratios of 1.08 (95% confidence interval 0.84-1.38) for 1 cup, 1.12 (0.96-1.31) for 2-3 cups and 0.95 (0.79-1.14) for ≥4 cups (P=0.30). After full adjustment, neither coffee nor tea drinking was associated with all-cause mortality. CONCLUSIONS In outpatients with stable coronary artery disease, there was no association between coffee or tea consumption and ischaemic outcomes or all-cause mortality.
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Affiliation(s)
- Jeremie Abtan
- Université de Paris, Hôpital Bichat, AP-HP, 75018 Paris, France; FACT (French Alliance for Cardiovascular Trials), Paris, France; INSERM U-1148, 75018 Paris, France.
| | - Gregory Ducrocq
- Université de Paris, Hôpital Bichat, AP-HP, 75018 Paris, France
| | - Yedid Elbez
- Université de Paris, Hôpital Bichat, AP-HP, 75018 Paris, France
| | - Roberto Ferrari
- Centro Cardiologico Universitario and LTTA Centre, University of Ferrara, 44124 Cona, Ferrara, Italy; Maria Cecilia Hospital, GVM Care & Research, E.S. Health Science Foundation, 48033 Cotignola (RA), Italy
| | - Ian Ford
- Robertson Centre for Biostatistics, University of Glasgow, G12 8QQ Glasgow, UK
| | - Kim M Fox
- National Heart and Lung Institute, Imperial College, SW3 6LY London, UK; Institute of Cardiovascular Medicine and Science, Royal Brompton Hospital, SW3 6NP London, UK
| | - Jean-Claude Tardif
- Montreal Heart Institute, Université de Montréal, QC H1T 1C8 Montreal, Canada
| | - Michal Tendera
- Department of Cardiology and Structural Heart Disease, School of Medicine in Katowice, Medical University of Silesia, 40-055 Katowice, Poland
| | - Nicolas Danchin
- Cardiology Department, Georges Pompidou European Hospital, 75015 Paris, France
| | | | - Christopher M Reid
- Centre of Clinical Research and Education in Therapeutics, Monash University, Melbourne, 3800 Victoria, Australia; School of Public Health, Curtin University, 6102 Perth, Western Australia, Australia
| | - P Gabriel Steg
- Université de Paris, Hôpital Bichat, AP-HP, 75018 Paris, France
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Chaudhary P, Mitra D, Das Mohapatra PK, Oana Docea A, Mon Myo E, Janmeda P, Martorell M, Iriti M, Ibrayeva M, Sharifi-Rad J, Santini A, Romano R, Calina D, Cho WC. Camellia sinensis: insights on its molecular mechanisms of action towards nutraceutical, anticancer potential and other therapeutic applications. ARAB J CHEM 2023. [DOI: 10.1016/j.arabjc.2023.104680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
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5
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Li XX, Liu C, Dong SL, Ou CS, Lu JL, Ye JH, Liang YR, Zheng XQ. Anticarcinogenic potentials of tea catechins. Front Nutr 2022; 9:1060783. [PMID: 36545470 PMCID: PMC9760998 DOI: 10.3389/fnut.2022.1060783] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 11/21/2022] [Indexed: 12/07/2022] Open
Abstract
Catechins are a cluster of polyphenolic bioactive components in green tea. Anticarcinogenic effects of tea catechins have been reported since the 1980s, but it has been controversial. The present paper reviews the advances in studies on the anticarcinogenic activities of tea and catechins, including epidemiological evidence and anticarcinogenic mechanism. Tea catechins showed antagonistic effects on many cancers, such as gynecological cancers, digestive tract cancers, incident glioma, liver and gallbladder cancers, lung cancer, etc. The mechanism underlying the anticarcinogenic effects of catechins involves in inhibiting the proliferation and growth of cancer cells, scavenging free radicals, suppressing metastasis of cancer cells, improving immunity, interacting with other anticancer drugs, and regulating signaling pathways. The inconsistent results and their causes are also discussed in this paper.
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Affiliation(s)
- Xiao-Xiang Li
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Chang Liu
- Tea Science Society of China, Hangzhou, China
| | - Shu-Ling Dong
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Can-Song Ou
- Development Center of Liubao Tea Industry, Cangwu, China
| | - Jian-Liang Lu
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Jian-Hui Ye
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Yue-Rong Liang
- Tea Research Institute, Zhejiang University, Hangzhou, China,*Correspondence: Yue-Rong Liang,
| | - Xin-Qiang Zheng
- Tea Research Institute, Zhejiang University, Hangzhou, China,Xin-Qiang Zheng,
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Yang X, Dai H, Deng R, Zhang Z, Quan Y, Giri M, Shen J. Association between tea consumption and prevention of coronary artery disease: A systematic review and dose-response meta-analysis. Front Nutr 2022; 9:1021405. [PMID: 36505265 PMCID: PMC9729734 DOI: 10.3389/fnut.2022.1021405] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/31/2022] [Indexed: 11/25/2022] Open
Abstract
Background Evidence from previous studies reporting on the relationship between tea consumption and its preventive effect on coronary artery disease (CAD) has conflicting outcomes. With the accumulation of new clinical evidence, we conducted this meta-analysis to assess tea consumption and CAD risk. Methods We searched PubMed, EMBASE, Cochrane Library, and Medline databases for published observational studies from their inception to May 2022. A random-effects model was used to calculate risk ratios with 95% confidence intervals. We also conducted linear and non-linear dose-response meta-analyses to analyze the association. We regarded that one cup equals 237 mL. Subgroup analyses and univariate meta-regression were conducted to explore the source of heterogeneity. Results A total of 35 studies, including 24 on green tea and 11 on black tea consumption, were included in this meta-analysis. An inverse association for the risk of CAD was observed for black tea (RR: 0.85; 95% CI: 0.76, 0.96) and green tea (RR: 0.93; 95% CI: 0.88, 0.99). The dose-response meta-analysis showed that drinking less than four cups of black tea daily may effectively prevent CAD, while more than 4-6 cups/d will promote disease risk. Furthermore, the dose-response relationship between green tea consumption and the prevention of CAD showed that the risk of CAD gradually decreased as green tea consumption increased. We also demonstrated that the more cups of green tea consumed, the lower the risk of CAD. In the subgroup analysis by continent, a significant negative correlation between CAD risk and green tea consumption was observed in the Asian population (RR: 0.92; 95% CI: 0.85, 0.99) but not in the western population [North America (RR: 0.97; 95% CI: 0.92, 1.03), Europe/Oceana (RR: 0.91; 95% CI: 0.78, 1.07)]. Conclusions Higher green tea consumption was associated with reduced CAD risk, but drinking more than 4-6 cups of black tea per day may increase the risk. This study offers new insight into the relationship between tea consumption and its preventive effect on CAD. However, further large prospective cohort studies are needed to validate these findings. Systematic review registration The protocol of this systematic review was registered in the International Prospective Register of Systematic Reviews (PROSPERO) system (CRD42022348069).
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Affiliation(s)
- Xin Yang
- The First College of Clinical Medicine, Chongqing Medical University, Chongqing, China
| | - Haiyun Dai
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ruihang Deng
- The First College of Clinical Medicine, Chongqing Medical University, Chongqing, China
| | - Ziang Zhang
- The First College of Clinical Medicine, Chongqing Medical University, Chongqing, China
| | - Yiwen Quan
- The First College of Clinical Medicine, Chongqing Medical University, Chongqing, China
| | - Mohan Giri
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jian Shen
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China,*Correspondence: Jian Shen
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Trisha AT, Shakil MH, Talukdar S, Rovina K, Huda N, Zzaman W. Tea Polyphenols and Their Preventive Measures against Cancer: Current Trends and Directions. Foods 2022; 11:3349. [PMID: 36359962 PMCID: PMC9658101 DOI: 10.3390/foods11213349] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/11/2022] [Accepted: 10/13/2022] [Indexed: 07/30/2023] Open
Abstract
Cancer is exerting an immense strain on the population and health systems all over the world. Green tea because of its higher simple catechin content (up to 30% on dry weight basis) is greatly popular as an anti-cancer agent which is found to reduce the risks of cancer as well as a range of other diseases. In addition, several in vitro and in vivo studies have shown that green tea possesses copious health benefits like anti-diabetic, anti-obese, anti-inflammatory, neuro-protective, cardio-protective, etc. This review highlights the anti-carcinogenic effects of green tea catechins integrating the recent information to gain a clear concept. Special emphasis was given to the effectiveness of green tea polyphenols (GTP) in the prevention of cancer. Overall, green tea has been found to be effective to reduce the risks of breast cancer, ovarian cancer, liver cancer, colorectal cancer, skin cancer, prostate cancer, oral cancer, etc. However, sufficient information was not found to support that green tea consumption reduces the risk of lung cancer, esophageal cancer, or stomach cancer. The exciting data integrated into this article will increase interest in future researchers to garner more fruitful information on the relevant topics.
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Affiliation(s)
- Anuva Talukder Trisha
- Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Mynul Hasan Shakil
- Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Suvro Talukdar
- Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Kobun Rovina
- Faculty of Food Science and Nutrition, Universiti Malaysia Sabah, Kota Kinabalu 88400, Sabah, Malaysia
| | - Nurul Huda
- Faculty of Food Science and Nutrition, Universiti Malaysia Sabah, Kota Kinabalu 88400, Sabah, Malaysia
| | - Wahidu Zzaman
- Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
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Green tea polyphenols in cardiometabolic health: A critical appraisal on phytogenomics towards personalized green tea. PHARMANUTRITION 2022. [DOI: 10.1016/j.phanu.2022.100296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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9
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Shirota M, Watanabe N, Suzuki M, Kobori M. Japanese-Style Diet and Cardiovascular Disease Mortality: A Systematic Review and Meta-Analysis of Prospective Cohort Studies. Nutrients 2022; 14:nu14102008. [PMID: 35631146 PMCID: PMC9147868 DOI: 10.3390/nu14102008] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/27/2022] [Accepted: 05/07/2022] [Indexed: 02/05/2023] Open
Abstract
This systematic review and meta-analysis elucidate the effects of the Japanese-style diet and characteristic Japanese foods on the mortality risk of cardiovascular disease (CVD), cerebrovascular disease (stroke), and heart disease (HD). This review article followed the PRISMA guidelines. A systematic search in PubMed, The Cochrane Library, JDreamIII, and ICHUSHI Web identified prospective cohort studies on Japanese people published till July 2020. The meta-analysis used a random-effects model, and heterogeneity and publication bias were evaluated with I2 statistic and Egger’s test, respectively. Based on inclusion criteria, we extracted 58 articles, including 9 on the Japanese-style diet (n = 469,190) and 49 (n = 2,668,238) on characteristic Japanese foods. With higher adherence to the Japanese-style diet, the pooled risk ratios (RRs) for CVD, stroke, heart disease/ischemic heart disease combined (HD/IHD) mortality were 0.83 (95% CI, 0.77–0.89, I2 = 58%, Egger’s test: p = 0.625, n = 9 studies), 0.80 (95% CI, 0.69–0.93, I2 = 66%, Egger’s test: p = 0.602, n = 6 studies), and 0.81 (95% CI, 0.75–0.88, I2 = 0%, Egger’s test: p = 0.544, n = 6 studies), respectively. Increased consumption of vegetables, fruits, fish, green tea, and milk and dairy products decreased the RR for CVD, stroke, or HD mortality. Increased salt consumption elevated the RR for CVD and stroke mortality. Increased consumption of dietary fiber and plant-derived protein decreased the RR for CVD, stroke, and HD/IHD mortality. The Japanese-style diet and characteristic Japanese foods may reduce CVD mortality. Most studies conducted diet surveys between 1980 and the 1990s. This meta-analysis used articles that evaluated the same cohort study by a different method. A new large-scale cohort study matching the current Japanese dietary habits is needed to confirm these findings.
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Affiliation(s)
- Masayuki Shirota
- Institute of Food Research, National Agriculture and Food Research Organization, 2-1-2 Kannondai, Tsukuba-shi 305-8642, Ibaraki, Japan;
| | - Norikazu Watanabe
- Yakujihou Marketing Jimusho Inc., Level 3, Sanno Park Tower, 2-11-1 Nagata-cho, Chiyoda-ku, Tokyo 100-6162, Japan; (N.W.); (M.S.)
| | - Masataka Suzuki
- Yakujihou Marketing Jimusho Inc., Level 3, Sanno Park Tower, 2-11-1 Nagata-cho, Chiyoda-ku, Tokyo 100-6162, Japan; (N.W.); (M.S.)
| | - Masuko Kobori
- Institute of Food Research, National Agriculture and Food Research Organization, 2-1-2 Kannondai, Tsukuba-shi 305-8642, Ibaraki, Japan;
- Correspondence: ; Tel.: +81-29-838-8011
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Shin S, Lee JE, Loftfield E, Shu XO, Abe SK, Rahman MS, Saito E, Islam MR, Tsugane S, Sawada N, Tsuji I, Kanemura S, Sugawara Y, Tomata Y, Sadakane A, Ozasa K, Oze I, Ito H, Shin MH, Ahn YO, Park SK, Shin A, Xiang YB, Cai H, Koh WP, Yuan JM, Yoo KY, Chia KS, Boffetta P, Ahsan H, Zheng W, Inoue M, Kang D, Potter JD, Matsuo K, Qiao YL, Rothman N, Sinha R. Coffee and tea consumption and mortality from all causes, cardiovascular disease and cancer: a pooled analysis of prospective studies from the Asia Cohort Consortium. Int J Epidemiol 2022; 51:626-640. [PMID: 34468722 PMCID: PMC9308394 DOI: 10.1093/ije/dyab161] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 07/15/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Accumulating evidence suggests that consuming coffee may lower the risk of death, but evidence regarding tea consumption in Asians is limited. We examined the association between coffee and tea consumption and mortality in Asian populations. METHODS We used data from 12 prospective cohort studies including 248 050 men and 280 454 women from the Asia Cohort Consortium conducted in China, Japan, Korea and Singapore. We estimated the study-specific association of coffee, green tea and black tea consumption with mortality using Cox proportional-hazards regression models and the pooled study-specific hazard ratios (HRs) using a random-effects model. RESULTS In total, 94 744 deaths were identified during the follow-up, which ranged from an average of 6.5 to 22.7 years. Compared with coffee non-drinkers, men and women who drank at least five cups of coffee per day had a 24% [95% confidence interval (CI) 17%, 29%] and a 28% (95% CI 19%, 37%) lower risk of all-cause mortality, respectively. Similarly, we found inverse associations for coffee consumption with cardiovascular disease (CVD)-specific and cancer-specific mortality among both men and women. Green tea consumption was associated with lower risk of mortality from all causes, CVD and other causes but not from cancer. The association of drinking green tea with CVD-specific mortality was particularly strong, with HRs (95% CIs) of 0.79 (0.68, 0.91) for men and 0.78 (0.68, 0.90) for women who drank at least five cups per day of green tea compared with non-drinkers. The association between black tea consumption and mortality was weak, with no clear trends noted across the categories of consumption. CONCLUSIONS In Asian populations, coffee consumption is associated with a lower risk of death overall and with lower risks of death from CVD and cancer. Green tea consumption is associated with lower risks of death from all causes and CVD.
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Affiliation(s)
- Sangah Shin
- Department of Food and Nutrition, Chung-Ang University, Gyeonggi-do, Korea
| | - Jung Eun Lee
- Department of Food and Nutrition, Seoul National University, Seoul, Korea
| | - Erikka Loftfield
- Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| | - Xiao-Ou Shu
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Sarah Krull Abe
- Division of Prevention, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Md Shafiur Rahman
- Division of Prevention, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Eiko Saito
- Division of Cancer Statistics Integration, Center for Cancer Control & Information Services, National Cancer Center, Tokyo, Japan
| | - Md Rashedul Islam
- Division of Prevention, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Shoichiro Tsugane
- Epidemiology and Prevention Group, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Norie Sawada
- Epidemiology and Prevention Group, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Ichiro Tsuji
- Department of Epidemiology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Seiki Kanemura
- Department of Epidemiology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yumi Sugawara
- Department of Epidemiology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yasutake Tomata
- Department of Epidemiology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Atsuko Sadakane
- Department of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan
| | - Kotaro Ozasa
- Department of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan
| | - Isao Oze
- Division of Cancer Epidemiology and Prevention, Department of Preventive Medicine, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Hidemi Ito
- Division of Cancer Information and Control, Department of Preventive Medicine, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Myung-Hee Shin
- Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine, Gyeonggi-do, Korea
| | - Yoon-Ok Ahn
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Sue K Park
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Aesun Shin
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Yong-Bing Xiang
- State Key Laboratory of Oncogene and Related Genes and Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Hui Cai
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Woon-Puay Koh
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore
| | - Jian-Min Yuan
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Keun-Young Yoo
- The Veterans Health Service Medical Center, Seoul, Korea
| | - Kee Seng Chia
- Saw Swee Hock School of Public Health, National University of Singapore, Republic of Singapore
| | - Paolo Boffetta
- Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY, USA
| | - Habibul Ahsan
- Department of Public Health Sciences, University of Chicago, Chicago, IL, USA
| | - Wei Zheng
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Manami Inoue
- Division of Prevention, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Daehee Kang
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - John D Potter
- Research Centre for Hauora and Health, Massey University, Wellington, New Zealand
| | - Keitaro Matsuo
- Division of Cancer Epidemiology and Prevention, Department of Preventive Medicine, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - You-Lin Qiao
- Center for Global Health, School of Population Medicine and Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Nathaniel Rothman
- Division of Cancer Epidemiology and Genetics, Department of Health and Human Services, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Rashmi Sinha
- Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
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Lange KW. Tea in cardiovascular health and disease: a critical appraisal of the evidence. FOOD SCIENCE AND HUMAN WELLNESS 2022. [DOI: 10.1016/j.fshw.2021.12.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Yang H, Yue GGL, Leung PC, Wong CK, Lau CBS. A review on the molecular mechanisms, the therapeutic treatment including the potential of herbs and natural products, and target prediction of obesity-associated colorectal cancer. Pharmacol Res 2021; 175:106031. [PMID: 34896542 DOI: 10.1016/j.phrs.2021.106031] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/07/2021] [Accepted: 12/07/2021] [Indexed: 02/07/2023]
Abstract
Colorectal cancer (CRC) is the third leading cause of cancer death worldwide. Obesity has been proven to be closely related to colorectal carcinogenesis. This review summarized the potential underlying mechanisms linking obesity to CRC in different aspects, including energy metabolism, inflammation, activities of adipokines and hormones. Furthermore, the potential therapeutic targets of obesity-associated CRC were predicted using network-based target analysis, with total predicted pathways not only containing previously reported pathways, but also putative signaling pathways pending for investigation. In addition, the current conventional therapeutic treatment options, plus the potential use of herbs and natural products in the management of obesity-associated CRC were also discussed. Taken together, the aim of this review article is to provide strong theoretical basis for future drug development, particularly herbs and natural products, in obesity-associated CRC.
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Affiliation(s)
- Huihai Yang
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Grace Gar Lee Yue
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Ping Chung Leung
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Chun Kwok Wong
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; Department of Chemical Pathology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Clara Bik San Lau
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
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13
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Zhao B. The pros and cons of drinking tea. TRADITIONAL MEDICINE AND MODERN MEDICINE 2021. [DOI: 10.1142/s2575900020300088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Tea is the most frequently consumed beverage worldwide besides water. Generally, there are five most popular types of tea: green, white, black, Pu’er, and oolong. Tea possesses significant antioxidant, anti-inflammatory, antimicrobial, anticarcinogenic, antihypertensive, neuroprotective, and cholesterol-lowering properties. Several research investigations, epidemiological studies, and meta-analyses suggest that tea and its bioactive polyphenolic constituents have numerous beneficial effects on health, including the prevention of many diseases, such as cancer, diabetes, arthritis, cardiovascular disease, stroke, and obesity. Recently, there are many reports about the resistance of tea to COVID-19 virus on the Internet, which has attracted a lot of attention to tea drinking and the discussion about the pros and cons of tea drinking. Based on our research results and relevant reports form literatures, this review is intended to highlight the beneficial effects and possible side-effects associated with tea consumption, answer 10 questions and point out a few matters for attention.
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Affiliation(s)
- Baolu Zhao
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Academia Sinica, Beijing 100101, P. R. China
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14
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Abstract
The purine alkaloid caffeine is the most widely consumed psychostimulant drug in the world and has multiple beneficial pharmacological activities, for example, in neurodegenerative diseases. However, despite being an extensively studied bioactive natural product, the mechanistic understanding of caffeine's pharmacological effects is incomplete. While several molecular targets of caffeine such as adenosine receptors and phosphodiesterases have been known for decades and inspired numerous medicinal chemistry programs, new protein interactions of the xanthine are continuously discovered providing potentially improved pharmacological understanding and a molecular basis for future medicinal chemistry. In this Perspective, we gather knowledge on the confirmed protein interactions, structure activity relationship, and chemical biology of caffeine on well-known and upcoming targets. The diversity of caffeine's molecular activities on receptors and enzymes, many of which are abundant in the CNS, indicates a complex interplay of several mechanisms contributing to neuroprotective effects and highlights new targets as attractive subjects for drug discovery.
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Affiliation(s)
- Giuseppe Faudone
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Silvia Arifi
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Daniel Merk
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
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15
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A latent class analysis of health lifestyles and health outcomes among Chinese older adults. AGEING & SOCIETY 2020. [DOI: 10.1017/s0144686x20001063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractPrior analyses have repeatedly documented the association between individual health behaviours and health outcomes. Nonetheless, few studies have taken a health lifestyle theory approach to examine how health lifestyle behaviours have shaped Chinese older adults’ health status. Using the most recent 2011–2012 data released by the Chinese Longitudinal Healthy Longevity Survey (CLHLS), latent class analysis was applied to identify predominant health lifestyles among Chinese older adults aged 65–105. Four distinct classes representing health lifestyles emerged. Furthermore, the research found the way in which the four classes representing older adults’ health lifestyles can be predicted by the respondent's demographic and socio-economic characteristics. In addition, health lifestyles were found to be strongly associated with Chinese older adults’ health outcomes which were measured by self-rated health, functional independence, cognitive function and chronic diseases, even after controlling for demographic features as well as individual and parental socio-economic disadvantage. Findings supported the cumulative disadvantage theory in health. The research highlighted the importance of promoting health lifestyles to improve older adults’ health outcomes.
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16
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Chung M, Zhao N, Wang D, Shams-White M, Karlsen M, Cassidy A, Ferruzzi M, Jacques PF, Johnson EJ, Wallace TC. Dose-Response Relation between Tea Consumption and Risk of Cardiovascular Disease and All-Cause Mortality: A Systematic Review and Meta-Analysis of Population-Based Studies. Adv Nutr 2020; 11:790-814. [PMID: 32073596 PMCID: PMC7360449 DOI: 10.1093/advances/nmaa010] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 10/23/2019] [Accepted: 01/18/2020] [Indexed: 01/11/2023] Open
Abstract
Tea flavonoids have been suggested to offer potential benefits to cardiovascular health. This review synthesized the evidence on the relation between tea consumption and risks of cardiovascular disease (CVD) and all-cause mortality among generally healthy adults. PubMed, EMBASE, Web of Science, Cochrane Central Register of Controlled Trials, Food Science and Technology Abstracts, and Ovid CAB Abstract databases were searched to identify English-language publications through 1 November 2019, including randomized trials, prospective cohort studies, and nested case-control (or case-cohort) studies with data on tea consumption and risk of incident cardiovascular events (cardiac or peripheral vascular events), stroke events (including mortality), CVD-specific mortality, or all-cause mortality. Data from 39 prospective cohort publications were synthesized. Linear meta-regression showed that each cup (236.6 mL) increase in daily tea consumption (estimated 280 mg and 338 mg total flavonoids/d for black and green tea, respectively) was associated with an average 4% lower risk of CVD mortality, a 2% lower risk of CVD events, a 4% lower risk of stroke, and a 1.5% lower risk of all-cause mortality. Subgroup meta-analysis results showed that the magnitude of association was larger in elderly individuals for both CVD mortality (n = 4; pooled adjusted RR: 0.89; 95% CI: 0.83, 0.96; P = 0.001), with large heterogeneity (I2 = 72.4%), and all-cause mortality (n = 3; pooled adjusted RR: 0.92; 95% CI: 0.90, 0.94; P < 0.0001; I2 = 0.3%). Generally, studies with higher risk of bias appeared to show larger magnitudes of associations than studies with lower risk of bias. Strength of evidence was rated as low and moderate (depending on study population age group) for CVD-specific mortality outcome and was rated as low for CVD events, stroke, and all-cause mortality outcomes. Daily tea intake as part of a healthy habitual dietary pattern may be associated with lower risks of CVD and all-cause mortality among adults.
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Affiliation(s)
- Mei Chung
- Department of Public Health and Community Medicine, School of Medicine, Tufts University, Boston, MA, USA
| | - Naisi Zhao
- Department of Public Health and Community Medicine, School of Medicine, Tufts University, Boston, MA, USA
| | - Deena Wang
- D&V Systematic Evidence Review Consulting, LLC, Bronx, NY, USA
| | | | - Micaela Karlsen
- University of New England, Portland, ME, USA,American College of Lifestyle Medicine, Chesterfield, MO, USA
| | - Aedín Cassidy
- Department of Nutrition and Preventive Medicine, Norwich Medical School, University of East Anglia, Norwich, United Kingdom
| | - Mario Ferruzzi
- Plants for Human Health Institute, North Carolina State University, Kannapolis, NC, USA
| | - Paul F Jacques
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA
| | - Elizabeth J Johnson
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA
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17
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Hoshi M, Aida J, Kusama T, Yamamoto T, Kiuchi S, Yamamoto T, Ojima T, Kondo K, Osaka K. Is the Association between Green Tea Consumption and the Number of Remaining Teeth Affected by Social Networks?: A Cross-Sectional Study from the Japan Gerontological Evaluation Study Project. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17062052. [PMID: 32244856 PMCID: PMC7142926 DOI: 10.3390/ijerph17062052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 03/16/2020] [Indexed: 01/06/2023]
Abstract
Consumption of green tea without sugar, as well as social networks, are associated with a lower risk of tooth loss. There is a possibility of confounding both factors because tea is often drunk with friends. Therefore, the present study aimed to examine whether green tea consumption is beneficially associated with the number of remaining teeth, while considering social networks. This cross-sectional study was based on the Japan Gerontological Evaluation Study (JAGES) in 2016. Self-administered questionnaires containing questions about green tea consumption were mailed to 34,567 community-dwelling residents aged ≥ 65 years. We used the number of remaining teeth as a dependent variable, and green tea consumption and the number of friends met over the past month (social network size) as independent variables. Linear regression models with multiple imputation were used. A total of 24,147 people responded (response rate = 69.9%), and 22,278 valid data were included into our analysis. Participants’ mean age was 74.2 years (standard deviation = 6.3), and 45.9% were men. Among the participants, 52.2% had ≥ 20 teeth, 34.2% drank 2–3 cups of green tea per day, and 32.6% met ≥ 10 people over the past month. After adjusting for all potential confounders, both higher green tea consumption and a larger social network size were associated with more remaining teeth (both p for trend < 0.001). The association of green tea was greater among those with smaller social networks (p for interaction < 0.05). The protective association of green tea was remarkable among people with smaller social networks.
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Affiliation(s)
- Manami Hoshi
- Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; (M.H.); (T.K.); (T.Y.); (S.K.); (K.O.)
| | - Jun Aida
- Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; (M.H.); (T.K.); (T.Y.); (S.K.); (K.O.)
- Correspondence: ; Tel.: +81-22-717-7639
| | - Taro Kusama
- Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; (M.H.); (T.K.); (T.Y.); (S.K.); (K.O.)
| | - Takafumi Yamamoto
- Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; (M.H.); (T.K.); (T.Y.); (S.K.); (K.O.)
| | - Sakura Kiuchi
- Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; (M.H.); (T.K.); (T.Y.); (S.K.); (K.O.)
| | - Tatsuo Yamamoto
- Department of Disaster Medicine and Dental Sociology, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka 238-8580, Japan;
| | - Toshiyuki Ojima
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan;
| | - Katsunori Kondo
- Center of Preventive Medical Sciences, Chiba University, Chiba 260-0856, Japan;
- National Center for Geriatrics and Gerontology, Obu 474-8511, Japan
| | - Ken Osaka
- Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; (M.H.); (T.K.); (T.Y.); (S.K.); (K.O.)
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18
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Filippini T, Malavolti M, Borrelli F, Izzo AA, Fairweather-Tait SJ, Horneber M, Vinceti M. Green tea (Camellia sinensis) for the prevention of cancer. Cochrane Database Syst Rev 2020; 3:CD005004. [PMID: 32118296 PMCID: PMC7059963 DOI: 10.1002/14651858.cd005004.pub3] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND This review is an update of a previously published review in the Cochrane Database of Systematic Reviews (2009, Issue 3).Tea is one of the most commonly consumed beverages worldwide. Teas from the plant Camellia sinensis can be grouped into green, black and oolong tea, and drinking habits vary cross-culturally. C sinensis contains polyphenols, one subgroup being catechins. Catechins are powerful antioxidants, and laboratory studies have suggested that these compounds may inhibit cancer cell proliferation. Some experimental and nonexperimental epidemiological studies have suggested that green tea may have cancer-preventative effects. OBJECTIVES To assess possible associations between green tea consumption and the risk of cancer incidence and mortality as primary outcomes, and safety data and quality of life as secondary outcomes. SEARCH METHODS We searched eligible studies up to January 2019 in CENTRAL, MEDLINE, Embase, ClinicalTrials.gov, and reference lists of previous reviews and included studies. SELECTION CRITERIA We included all epidemiological studies, experimental (i.e. randomised controlled trials (RCTs)) and nonexperimental (non-randomised studies, i.e. observational studies with both cohort and case-control design) that investigated the association of green tea consumption with cancer risk or quality of life, or both. DATA COLLECTION AND ANALYSIS Two or more review authors independently applied the study criteria, extracted data and assessed methodological quality of studies. We summarised the results according to diagnosis of cancer type. MAIN RESULTS In this review update, we included in total 142 completed studies (11 experimental and 131 nonexperimental) and two ongoing studies. This is an additional 10 experimental and 85 nonexperimental studies from those included in the previous version of the review. Eleven experimental studies allocated a total of 1795 participants to either green tea extract or placebo, all demonstrating an overall high methodological quality based on 'Risk of bias' assessment. For incident prostate cancer, the summary risk ratio (RR) in the green tea-supplemented participants was 0.50 (95% confidence interval (CI) 0.18 to 1.36), based on three studies and involving 201 participants (low-certainty evidence). The summary RR for gynaecological cancer was 1.50 (95% CI 0.41 to 5.48; 2 studies, 1157 participants; low-certainty evidence). No evidence of effect of non-melanoma skin cancer emerged (summary RR 1.00, 95% CI 0.06 to 15.92; 1 study, 1075 participants; low-certainty evidence). In addition, adverse effects of green tea extract intake were reported, including gastrointestinal disorders, elevation of liver enzymes, and, more rarely, insomnia, raised blood pressure and skin/subcutaneous reactions. Consumption of green tea extracts induced a slight improvement in quality of life, compared with placebo, based on three experimental studies. In nonexperimental studies, we included over 1,100,000 participants from 46 cohort studies and 85 case-control studies, which were on average of intermediate to high methodological quality based on Newcastle-Ottawa Scale 'Risk of bias' assessment. When comparing the highest intake of green tea with the lowest, we found a lower overall cancer incidence (summary RR 0.83, 95% CI 0.65 to 1.07), based on three studies, involving 52,479 participants (low-certainty evidence). Conversely, we found no association between green tea consumption and cancer-related mortality (summary RR 0.99, 95% CI 0.91 to 1.07), based on eight studies and 504,366 participants (low-certainty evidence). For most of the site-specific cancers we observed a decreased RR in the highest category of green tea consumption compared with the lowest one. After stratifying the analysis according to study design, we found strongly conflicting results for some cancer sites: oesophageal, prostate and urinary tract cancer, and leukaemia showed an increased RR in cohort studies and a decreased RR or no difference in case-control studies. AUTHORS' CONCLUSIONS Overall, findings from experimental and nonexperimental epidemiological studies yielded inconsistent results, thus providing limited evidence for the beneficial effect of green tea consumption on the overall risk of cancer or on specific cancer sites. Some evidence of a beneficial effect of green tea at some cancer sites emerged from the RCTs and from case-control studies, but their methodological limitations, such as the low number and size of the studies, and the inconsistencies with the results of cohort studies, limit the interpretability of the RR estimates. The studies also indicated the occurrence of several side effects associated with high intakes of green tea. In addition, the majority of included studies were carried out in Asian populations characterised by a high intake of green tea, thus limiting the generalisability of the findings to other populations. Well conducted and adequately powered RCTs would be needed to draw conclusions on the possible beneficial effects of green tea consumption on cancer risk.
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Affiliation(s)
- Tommaso Filippini
- University of Modena and Reggio Emilia, Research Center in Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Department of Biomedical, Metabolic and Neural Sciences, Via Campi 287, Modena, Italy, 41125
| | - Marcella Malavolti
- University of Modena and Reggio Emilia, Research Center in Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Department of Biomedical, Metabolic and Neural Sciences, Via Campi 287, Modena, Italy, 41125
| | - Francesca Borrelli
- University of Naples 'Federico II', Department of Pharmacy, School of Medicine and Surgery, Via D Montesano 49, Naples, Italy, 80131
| | - Angelo A Izzo
- University of Naples 'Federico II', Department of Pharmacy, School of Medicine and Surgery, Via D Montesano 49, Naples, Italy, 80131
| | | | - Markus Horneber
- Paracelsus Medical University, Klinikum Nuremberg, Department of Internal Medicine, Division of Oncology and Hematology, Prof.-Ernst-Nathan-Str. 1, Nuremberg, Germany, D-90419
| | - Marco Vinceti
- University of Modena and Reggio Emilia, Research Center in Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Department of Biomedical, Metabolic and Neural Sciences, Via Campi 287, Modena, Italy, 41125
- Boston University School of Public Health, Department of Epidemiology, 715 Albany Street, Boston, USA, MA 02118
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19
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Zhu MZ, Lu DM, Ouyang J, Zhou F, Huang PF, Gu BZ, Tang JW, Shen F, Li JF, Li YL, Lin HY, Li J, Zeng X, Wu JL, Cai SX, Wang KB, Huang JA, Liu ZH. Tea consumption and colorectal cancer risk: a meta-analysis of prospective cohort studies. Eur J Nutr 2020; 59:3603-3615. [PMID: 32078065 DOI: 10.1007/s00394-020-02195-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 01/28/2020] [Indexed: 12/22/2022]
Abstract
PURPOSE Data from in vitro and animal studies support the preventive effect of tea (Camellia sinensis) against colorectal cancer. Further, many epidemiologic studies evaluated the association between tea consumption and colorectal cancer risk, but the results were inconsistent. We conducted a meta-analysis of prospective cohort studies to systematically assess the association between tea consumption and colorectal cancer risk. METHODS A comprehensive literature review was conducted to identify the related articles by searching PubMed and Embase up to June, 2019. Summary relative risks (RRs) and 95% confidence intervals (CIs) were calculated using a fixed effect model. RESULTS Twenty cohort articles were included in the present meta-analysis involving 2,068,137 participants and 21,437 cases. The combined RR of colorectal cancer for the highest vs. lowest tea consumption was determined to 0.97 (95% CI 0.94-1.01) with marginal heterogeneity (I2 = 24.0%, P = 0.093) among all studies. This indicated that tea consumption had no significant association with colorectal cancer risk. Stratified analysis showed that no significant differences were found in all subgroups. We further conducted the gender-specific meta-analysis for deriving a more precise estimation. No significant association was observed between tea consumption and colorectal cancer risk in male (combined RR = 0.97; 95% CI 0.90-1.04). However, tea consumption had a marginal significant inverse impact on colorectal cancer risk in female (combined RR = 0.93; 95% CI 0.86-1.00). Further, we found a stronger inverse association between tea consumption and risk of colorectal cancer among the female studies with no adjustment of coffee intake (RR: 0.90; 95% CI 0.82-1.00, P < 0.05) compared to the female studies that adjusted for coffee intake (RR = 0.97; 95% CI 0.87-1.09, P > 0.05). CONCLUSIONS Our finding indicates that tea consumption has no significant impact on the colorectal cancer risk in both genders combined, but gender-specific meta-analysis shows that tea consumption has a marginal significant inverse impact on colorectal cancer risk in female.
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Affiliation(s)
- Ming-Zhi Zhu
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China.,Hunan Provincial Key Laboratory for Germplasm Innovation and Utilization of Crop, Hunan Agricultural University, Changsha, 410128, China
| | - Dan-Min Lu
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Jian Ouyang
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Fang Zhou
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Pei-Fang Huang
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Bao-Zheng Gu
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Jun-Wei Tang
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Fan Shen
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Jia-Feng Li
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Yi-Long Li
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Hai-Yan Lin
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Juan Li
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Xin Zeng
- College of Life Sciences, Huaibei Normal University, Huaibei, 235000, China.
| | - Jian-Lin Wu
- State Key Laboratory for Quality Research of Chinese Medicines, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macao, 999078, China
| | - Shu-Xian Cai
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Kun-Bo Wang
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Jian-An Huang
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China
| | - Zhong-Hua Liu
- Key Laboratory of Tea Science of Ministry of Education, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, College of Horticulture, Hunan Agricultural University, Changsha, 410128, China.
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20
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Abe SK, Saito E, Sawada N, Tsugane S, Ito H, Lin Y, Tamakoshi A, Sado J, Kitamura Y, Sugawara Y, Tsuji I, Nagata C, Sadakane A, Shimazu T, Mizoue T, Matsuo K, Naito M, Tanaka K, Inoue M. Green tea consumption and mortality in Japanese men and women: a pooled analysis of eight population-based cohort studies in Japan. Eur J Epidemiol 2019; 34:917-926. [DOI: 10.1007/s10654-019-00545-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 07/27/2019] [Indexed: 12/31/2022]
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21
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Wada K, Oba S, Tsuji M, Goto Y, Mizuta F, Koda S, Uji T, Hori A, Tanabashi S, Matsushita S, Tokimitsu N, Nagata C. Green tea intake and colorectal cancer risk in Japan: the Takayama study. Jpn J Clin Oncol 2019; 49:515-520. [PMID: 30855678 DOI: 10.1093/jjco/hyz030] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 02/12/2019] [Accepted: 02/28/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Reportedly, green tea has a preventive effect against colorectal cancer in animal models. Nevertheless, results from epidemiological studies of the association between green tea consumption and colorectal cancer have been inconsistent. We aimed to evaluate colorectal cancer risk in relation to green tea consumption in a population-based prospective cohort study. METHODS Subjects were 13 957 men and 16 374 women aged ≥35 years in September 1992. The participants' green tea consumption was elicited by administering a food frequency questionnaire. The colorectal cancer incidence was confirmed through regional population-based cancer registries and histological identification from colonoscopy in two main hospitals in the study area. Colorectal cancer was defined as the sum of code C18 (colon cancer) and codes C19 and C20 (rectal cancer) according to ICD-10. RESULTS Up to March 2008, 429 men and 343 women were diagnosed with colorectal cancer. No significant association was found between green tea consumption and colorectal cancer in men and women, respectively. However, for men, compared with the group of 'none or less than once per day' of green tea consumption, the multiple-adjusted relative risks (95% CIs) for colon cancer were 1.32 (0.90, 1.94), 0.76 (0.57, 1.02), and 0.78 (0.49, 1.22), respectively, in the group of 'once per day,' '2-3 times per day', and 'four times per day or more' (trend P = 0.045). CONCLUSIONS This study observed no overall significant associations between green tea consumption and colorectal cancer risk, except that there was a weak trend for greater consumption of green tea with decreased risk of male colon cancer.
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Affiliation(s)
- Keiko Wada
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu
| | - Shino Oba
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu.,Graduate School of Health Sciences, Gunma University, Gunma
| | - Michiko Tsuji
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu.,Department of Food Science and Nutrition, Nagoya women's University, Aichi
| | - Yuko Goto
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu
| | - Fumi Mizuta
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu
| | - Sachi Koda
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu
| | - Takahiro Uji
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu
| | | | | | | | - Naoki Tokimitsu
- Department of Internal Medicine, Takayama Red Cross Hospital, Gifu
| | - Chisato Nagata
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu
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22
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Fang J, Sureda A, Silva AS, Khan F, Xu S, Nabavi SM. Trends of tea in cardiovascular health and disease: A critical review. Trends Food Sci Technol 2019. [DOI: 10.1016/j.tifs.2019.04.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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23
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Castelletti S. Dietary components and risk of cardiovascular disease and all-cause mortality: A review under the sign of the carrot. Eur J Prev Cardiol 2019; 26:1412-1414. [PMID: 31109186 DOI: 10.1177/2047487319852678] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Silvia Castelletti
- Istituto Auxologico Italiano, IRCCS, Centre for Cardiac Arrhythmias of Genetic Origin, Milan, Italy
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24
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Caffeine and cardiovascular health. Regul Toxicol Pharmacol 2017; 89:165-185. [DOI: 10.1016/j.yrtph.2017.07.025] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 07/21/2017] [Accepted: 07/23/2017] [Indexed: 02/07/2023]
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25
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Espinosa Ruiz C, Cabrera L, López-Jiménez JÁ, Zamora S, Pérez-Llamas F. Effects of long-term ingestion of white tea on oxidation produced by aging and acute oxidative damage in rats. J Physiol Biochem 2017; 74:171-177. [DOI: 10.1007/s13105-017-0591-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 09/07/2017] [Indexed: 01/10/2023]
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26
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Shirakami Y, Ohnishi M, Sakai H, Tanaka T, Shimizu M. Prevention of Colorectal Cancer by Targeting Obesity-Related Disorders and Inflammation. Int J Mol Sci 2017; 18:ijms18050908. [PMID: 28445390 PMCID: PMC5454821 DOI: 10.3390/ijms18050908] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 04/17/2017] [Accepted: 04/20/2017] [Indexed: 02/07/2023] Open
Abstract
Colorectal cancer is a major healthcare concern worldwide. Many experimental and clinical studies have been conducted to date to discover agents that help in the prevention of this disease. Chronic inflammation in colonic mucosa and obesity, and its related metabolic abnormalities, are considered to increase the risk of colorectal cancer. Therefore, treatments targeting these factors might be a promising strategy to prevent the development of colorectal cancer. Among a number of functional foods, various phytochemicals, including tea catechins, which have anti-inflammatory and anti-obesity properties, and medicinal agents that ameliorate metabolic disorders, might also be beneficial in the prevention of colorectal cancer. In this review article, we summarize the strategies for preventing colorectal cancer by targeting obesity-related disorders and inflammation through nutraceutical and pharmaceutical approaches, and discuss the mechanisms of several phytochemicals and medicinal drugs used in basic and clinical research, especially focusing on the effects of green tea catechins.
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Affiliation(s)
- Yohei Shirakami
- Department of Informative Clinical Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.
- Department of Gastroenterology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.
| | - Masaya Ohnishi
- Department of Gastroenterology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.
| | - Hiroyasu Sakai
- Department of Gastroenterology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.
| | - Takuji Tanaka
- Department of Pathological Diagnosis, Gifu Municipal Hospital, Gifu 500-8513, Japan.
| | - Masahito Shimizu
- Department of Gastroenterology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.
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27
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Nogueira LDP, Nogueira Neto JF, Klein MRST, Sanjuliani AF. Short-term Effects of Green Tea on Blood Pressure, Endothelial Function, and Metabolic Profile in Obese Prehypertensive Women: A Crossover Randomized Clinical Trial. J Am Coll Nutr 2016; 36:108-115. [PMID: 27797683 DOI: 10.1080/07315724.2016.1194236] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Green tea consumption has been inversely associated with cardiovascular disease (CVD) in epidemiological studies. Although some interventional trials suggest that green tea has beneficial effects on CVD risk factors, such as hypertension and obesity, others have failed to show such benefits. AIMS To evaluate the short-term effects of green tea on blood pressure, endothelial function, metabolic profile, and inflammatory activity in obese prehypertensive women. METHODS This study was a crossover, randomized, double-blind, placebo-controlled clinical trial. Participants were randomly allocated to receive daily 3 capsules containing either 500 mg of green tea extract (GTE) or a matching placebo for 4 weeks, with a washout period of 2 weeks between treatments. Each GTE capsule contained 260 mg of polyphenols. At the beginning and at the end of each treatment, participants were submitted to evaluation of blood pressure (ambulatory blood pressure monitoring, ABPM), endothelial function (Endo-PAT 2000 and cellular adhesion molecules), nutritional parameters, metabolic profile, and biomarkers of inflammation. RESULTS Twenty women age 41.1 ± 8.4 years completed the study. After 4 weeks of GTE supplementation in comparison with placebo, there was a significant decrease (p < 0.05) in systolic blood pressure at 24 hours (-3.61 ± 1.23 vs 1.05 ± 1.34 mmHg), daytime (-3.61 ± 1.26 vs 0.80 ± 1.57 mmHg), and nighttime (-3.94 ± 1.70 vs 1.90 ± 1.66 mmHg). Changes in diastolic blood pressure and in all other parameters did not present a significant difference between GTE and placebo. CONCLUSION The findings of this study suggest that in obese prehypertensive women, short-term daily intake of GTE may decrease blood pressure.
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Affiliation(s)
- Lívia de P Nogueira
- a Clinical and Experimental Pathophysiology , Rio de Janeiro State University , Rio de Janeiro , BRAZIL
| | | | - Márcia R S T Klein
- c Department of Applied Nutrition , Nutrition Institute, Rio de Janeiro State University , Rio de Janeiro , BRAZIL
| | - Antonio F Sanjuliani
- a Clinical and Experimental Pathophysiology , Rio de Janeiro State University , Rio de Janeiro , BRAZIL
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28
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Zhao LG, Li HL, Sun JW, Yang Y, Ma X, Shu XO, Zheng W, Xiang YB. Green tea consumption and cause-specific mortality: Results from two prospective cohort studies in China. J Epidemiol 2016; 27:36-41. [PMID: 28135196 PMCID: PMC5328738 DOI: 10.1016/j.je.2016.08.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Indexed: 10/29/2022] Open
Abstract
BACKGROUND Green tea is one of the most widely consumed beverages in Asia. While a possible protective role of green tea against various chronic diseases has been suggested in experimental studies, evidence from human studies remains controversial. METHODS We conducted this study using data from Shanghai Men's Health Study (SMHS) and Shanghai Women's Health Study (SWHS), two population-based prospective cohorts of middle-aged and elderly Chinese adults in urban Shanghai, China. Hazard ratios (HR) and 95% confidence intervals (CI) for risk of all-cause and cause-specific mortality associated with green tea intake were estimated using Cox proportional hazards regression models. RESULTS During a median follow-up of 8.3 and 14.2 years for men and women, respectively, 6517 (2741 men and 3776 women) deaths were documented. We found that green tea consumption was inversely associated with risk of all-cause mortality (HR 0.95; 95% CI, 0.90-1.01), particularly among never-smokers (HR 0.89; 95% CI, 0.82-0.96). The inverse association with cardiovascular disease (CVD) mortality (HR 0.86; 95% CI, 0.77-0.97) was slightly stronger than that with all-cause mortality. No significant association was observed between green tea intake and cancer mortality (HR 1.01; 95% CI, 0.93-1.10). CONCLUSIONS Green tea consumption may be inversely associated with risk of all-cause and CVD mortality in middle-aged and elderly Chinese adults, especially among never smokers.
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Affiliation(s)
- Long-Gang Zhao
- SKLORG & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Hong-Lan Li
- SKLORG & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Jiang-Wei Sun
- SKLORG & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yang Yang
- SKLORG & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiao Ma
- SKLORG & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiao-Ou Shu
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, USA
| | - Wei Zheng
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, USA
| | - Yong-Bing Xiang
- SKLORG & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.
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29
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Yamazaki K, Suzuki E, Yorifuji T, Tsuda T, Ohta T, Ishikawa-Takata K, Doi H. Is there an obesity paradox in the Japanese elderly population? A community-based cohort study of 13 280 men and women. Geriatr Gerontol Int 2016; 17:1257-1264. [DOI: 10.1111/ggi.12851] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Revised: 04/08/2016] [Accepted: 05/23/2016] [Indexed: 11/27/2022]
Affiliation(s)
- Kenji Yamazaki
- Department of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama University; Okayama Japan
| | - Etsuji Suzuki
- Department of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama University; Okayama Japan
| | - Takashi Yorifuji
- Department of Human Ecology, Graduate School of Environmental and Life Science; Okayama University; Okayama Japan
| | - Toshihide Tsuda
- Department of Human Ecology, Graduate School of Environmental and Life Science; Okayama University; Okayama Japan
| | - Toshiki Ohta
- National Hospital for Geriatric Medicine; National Center for Geriatrics and Gerontology; Aichi Japan
- Nagoya Heart Center; Aichi Japan
| | - Kazuko Ishikawa-Takata
- Program of Health Promotion and Exercise; National Institute of Health and Nutrition; Tokyo Japan
- Department of Nutritional Education; National Institutes of Biomedical Innovation, Health and Nutrition; Tokyo Japan
| | - Hiroyuki Doi
- Department of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama University; Okayama Japan
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30
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Liu J, Liu S, Zhou H, Hanson T, Yang L, Chen Z, Zhou M. Association of green tea consumption with mortality from all-cause, cardiovascular disease and cancer in a Chinese cohort of 165,000 adult men. Eur J Epidemiol 2016; 31:853-65. [PMID: 27372743 DOI: 10.1007/s10654-016-0173-3] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 06/07/2016] [Indexed: 01/13/2023]
Abstract
Tea is the most ancient and popular beverage in the world, and its beneficial health effects has attracted tremendous attention worldwide. However, the prospective evidence relating green tea consumption to total and cause-specific mortality is still limited and inconclusive. We recruited 164,681 male participants free of pre-existing disease during 1990-1991, with green tea consumption and other covariates assessed by the standardized questionnaire and mortality follow up continued until 2006 (mean 11 years; total person-years: 1,961,791). Cox regression analyses were used to quantify the associations of green tea consumption with all-cause (n = 32,700), CVD (n = 11,839) and cancer (n = 7002) mortality, adjusting simultaneously for potential confounders. At baseline, 18 % reported regular consumption of green tea. Compared with non-green tea drinkers, regular drinkers had significantly lower all-cause mortality, with adjusted hazard ratios (HRs) being 0.94 (95 % CI 0.89, 0.99) for ≤5 g/day, 0.95 (0.91, 0.99) for 5-10 g/day and 0.89 (0.85, 0.93) for >10 g/day. For CVD mortality, the corresponding HRs were 0.93 (0.85, 1.01) 0.91 (0.85, 0.98) and 0.86 (0.79, 0.93), respectively, while for cancer they were 0.86 (0.78, 0.98), 0.92 (0.83, 1.00) and 0.79 (0.71, 0.88), respectively. The patterns of these associations varied by smoking, alcohol drinking and locality. This large prospective study shows that regular green tea consumption is associated with significantly reduced risk of death from all-cause, CVD and cancer among Chinese adults.
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Affiliation(s)
- Junxiu Liu
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
| | - Shiwei Liu
- National Center for Chronic and Non-communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
- Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Richard Doll Building, Old Road Campus, Oxford, OX3-7LF, UK
| | - Haiming Zhou
- Division of Statistics, Northern Illinois University, Dekalb, IL, USA
| | - Timothy Hanson
- Department of Statistics, University of South Carolina, Columbia, SC, USA
| | - Ling Yang
- Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Richard Doll Building, Old Road Campus, Oxford, OX3-7LF, UK
| | - Zhengming Chen
- Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Richard Doll Building, Old Road Campus, Oxford, OX3-7LF, UK
| | - Maigeng Zhou
- National Center for Chronic and Non-communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
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31
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Espinosa C, López-Jiménez JA, Pérez-Llamas F, Guardiola FA, Esteban MA, Arnao MB, Zamora S. Long-term intake of white tea prevents oxidative damage caused by adriamycin in kidney of rats. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:3079-3087. [PMID: 26441376 DOI: 10.1002/jsfa.7483] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 08/11/2015] [Accepted: 09/26/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND White tea infusion (Camelia sinensis) has antioxidants properties. The infusion contains polyphenols that have been proposed to induce antioxidant response element (ARE) response via nuclear factor E2-related factor 2 (NRF2). Adriamycin (ADR) has antitumour properties and oxidative effects. Oxidative stress is related to a variety of kidney diseases. Prevention of the oxidative stress through long-term intake of white tea and the study of the molecular mechanisms involved in protection could be of great interest. Rats were given distilled water, 0.015 or 0.045 g of solid white tea extract kg(-1) body weight for 12 months. Animals received an injection of ADR. In kidney, oxidative stress parameters were measured, the expressions of nuclear factor E2-related factor 2 gene (Nrf2), and detoxifying and antioxidants genes were analysed, and the activities of catalase (CAT), superoxide dismutase (SOD) and glutathione reductase (GR) were measured. RESULTS ADR administration increased oxidative parameters and decreased the antioxidant activity; significantly increased the expression of analysed genes and the activity of CAT and SOD and decreased GR activity. The highest white tea dose protected redox status and inhibited ARE response. CONCLUSION Long-term intake of white tea protected kidney against the oxidative stress. ADR activated the ARE response but in animals treated with the highest dose of white tea, this response was inhibited, probably for antioxidant protection. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Cristóbal Espinosa
- Physiology Department, Faculty of Biology, University of Murcia, 30100, Murcia, Spain
| | - José A López-Jiménez
- Physiology Department, Faculty of Biology, University of Murcia, 30100, Murcia, Spain
| | | | - Francisco A Guardiola
- Fish Innate Immune System Group, Department of Cell Biology and Histology, Faculty of Biology, University of Murcia, 30100, Murcia, Spain
| | - Maria A Esteban
- Fish Innate Immune System Group, Department of Cell Biology and Histology, Faculty of Biology, University of Murcia, 30100, Murcia, Spain
| | - Marino B Arnao
- Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia, 30100, Murcia, Spain
| | - Salvador Zamora
- Physiology Department, Faculty of Biology, University of Murcia, 30100, Murcia, Spain
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32
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Momose Y, Maeda-Yamamoto M, Nabetani H. Systematic review of green tea epigallocatechin gallate in reducing low-density lipoprotein cholesterol levels of humans. Int J Food Sci Nutr 2016; 67:606-13. [PMID: 27324590 DOI: 10.1080/09637486.2016.1196655] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We conducted a systematic review of the literature for the ability of green tea epigallocatechin gallate (EGCG) to lower low-density lipoprotein cholesterol (LDL-C). Study subjects were limited to healthy individuals and randomized, controlled trials on human serum lipid levels, especially LDL-C, conducted. A total of 17 trials (n = 1356) met all of the inclusion criteria. According to weighted mean differences for changes from baseline with 95% confidence intervals (CI), 107-856 mg/d of EGCG for 4 to 14 weeks reduced LDL-C by -9.29 mg/dl (95% CI, -12.27 to -6.31). Sub-analysis was performed to compare the EGCG lowering effect on LDL-C between non-obese and obese subjects, EGCG dose, baseline of LDL-C levels, or BMI. We concluded that consumption of green tea EGCG resulted in a significant reduction of LDL-C at any baseline level and any dose between 107 and 856 mg/d, and the effect size was slightly dependent on the baseline lipid level of the subjects.
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Affiliation(s)
- Yuko Momose
- a Food Engineering Division , National Food Research Institute , Ibaraki , Japan
| | - Mari Maeda-Yamamoto
- b Food Function Division , National Food Research Institute , Ibaraki , Japan
| | - Hiroshi Nabetani
- a Food Engineering Division , National Food Research Institute , Ibaraki , Japan
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Khoogar R, Kim BC, Morris J, Wargovich MJ. Chemoprevention in gastrointestinal physiology and disease. Targeting the progression of cancer with natural products: a focus on gastrointestinal cancer. Am J Physiol Gastrointest Liver Physiol 2016; 310:G629-44. [PMID: 26893159 PMCID: PMC4867331 DOI: 10.1152/ajpgi.00201.2015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 02/11/2016] [Indexed: 01/31/2023]
Abstract
The last decade has witnessed remarkable progress in the utilization of natural products for the prevention and treatment of human cancer. Many agents now in the pipeline for clinical trial testing have evolved from our understanding of how human nutritional patterns account for widespread differences in cancer risk. In this review, we have focused on many of these promising agents arguing that they may provide a new strategy for cancer control: natural products once thought to be only preventive in their mode of action now are being explored for efficacy in tandem with cancer therapeutics. Natural products may reduce off-target toxicity of therapeutics while making cancers more amenable to therapy. On the horizon is the use of certain natural products, in their own right, as mitigants of late-stage cancer, a new frontier for small-molecule natural product drug discovery.
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Affiliation(s)
- Roxane Khoogar
- 1Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas; and
| | - Byung-Chang Kim
- 2Center for Colorectal Center, Center for Cancer Prevention and Detection, Research Institute and Hospital, National Cancer Center, Ilsan-ro, Illsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Jay Morris
- 1Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas; and
| | - Michael J. Wargovich
- 1Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas; and
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34
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Green tea consumption is associated with reduced incident CHD and improved CHD-related biomarkers in the Dongfeng-Tongji cohort. Sci Rep 2016; 6:24353. [PMID: 27072746 PMCID: PMC4829846 DOI: 10.1038/srep24353] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 03/24/2016] [Indexed: 12/22/2022] Open
Abstract
Prospective studies on the association of green tea with risk of coronary heart disease (CHD) incidence were scarce. This study examined whether green tea can reduce CHD incidence and have a beneficial effect on CHD-related risk markers in middle-aged and older Chinese population. We included 19 471 participants who were free of CHD, stroke or cancer at baseline from September 2008 to June 2010, and were followed until October 2013. Cox proportional hazard models were used to examine the hazard ratios (HR) of CHD incidence in relation to green tea consumption. Linear regression models were used to evaluate the effect of green tea on 5-year changes of CHD-related biomarkers. Compared with non-green tea consumers, the multivariable-adjusted HR for CHD was 0.89 (95% CI, 0.81-0.98) in green tea consumers. Particularly, the reduced risk of CHD incidence with green tea consumption was more evident among participants who were male, more than 60 years old, overweight, or with diabetes mellitus. In addition, green tea consumption improved multiple CHD-related risk markers including total cholesterol, HDL-cholesterol, triglycerides, mean platelet volume, and uric acid. In conclusion, green tea consumption was associated with a reduced risk of CHD incidence in the middle-aged and older Chinese populations, and the association might be partly due to altered CHD-related biomarkers.
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35
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Zeng Y, Chen H, Ni T, Ruan R, Nie C, Liu X, Feng L, Zhang F, Lu J, Li J, Li Y, Tao W, Gregory SG, Gottschalk W, Lutz MW, Land KC, Yashin A, Tan Q, Yang Z, Bolund L, Ming Q, Yang H, Min J, Willcox DC, Willcox BJ, Gu J, Hauser E, Tian XL, Vaupel JW. Interaction Between the FOXO1A-209 Genotype and Tea Drinking Is Significantly Associated with Reduced Mortality at Advanced Ages. Rejuvenation Res 2016; 19:195-203. [PMID: 26414954 DOI: 10.1089/rej.2015.1737] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
On the basis of the genotypic/phenotypic data from Chinese Longitudinal Healthy Longevity Survey (CLHLS) and Cox proportional hazard model, the present study demonstrates that interactions between carrying FOXO1A-209 genotypes and tea drinking are significantly associated with lower risk of mortality at advanced ages. Such a significant association is replicated in two independent Han Chinese CLHLS cohorts (p = 0.028-0.048 in the discovery and replication cohorts, and p = 0.003-0.016 in the combined dataset). We found the associations between tea drinking and reduced mortality are much stronger among carriers of the FOXO1A-209 genotype compared to non-carriers, and drinking tea is associated with a reversal of the negative effects of carrying FOXO1A-209 minor alleles, that is, from a substantially increased mortality risk to substantially reduced mortality risk at advanced ages. The impacts are considerably stronger among those who carry two copies of the FOXO1A minor allele than those who carry one copy. On the basis of previously reported experiments on human cell models concerning FOXO1A-by-tea-compounds interactions, we speculate that results in the present study indicate that tea drinking may inhibit FOXO1A-209 gene expression and its biological functions, which reduces the negative impacts of FOXO1A-209 gene on longevity (as reported in the literature) and offers protection against mortality risk at oldest-old ages. Our empirical findings imply that the health outcomes of particular nutritional interventions, including tea drinking, may, in part, depend upon individual genetic profiles, and the research on the effects of nutrigenomics interactions could potentially be useful for rejuvenation therapies in the clinic or associated healthy aging intervention programs.
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Affiliation(s)
- Yi Zeng
- 1 Center for the Study of Aging and Human Development and Geriatrics Division, Medical School of Duke University , Durham, North Carolina.,2 Center for Healthy Aging and Development Studies, National School of Development, Peking University , Beijing, China
| | - Huashuai Chen
- 1 Center for the Study of Aging and Human Development and Geriatrics Division, Medical School of Duke University , Durham, North Carolina.,3 Department of Management, Business School of Xiangtan University , Xiangtan, China
| | - Ting Ni
- 4 State Key Laboratory of Genetics Engineering & MOE Key Laboratory of Contemporary Anthropology, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University , Shanghai, China
| | - Rongping Ruan
- 5 Department of Agriculture Economics. Renmin University of China , Beijing, China
| | - Chao Nie
- 6 Beijing Genomics Institute (BGI)-Shenzhen , Shenzhen, China
| | - Xiaomin Liu
- 6 Beijing Genomics Institute (BGI)-Shenzhen , Shenzhen, China
| | - Lei Feng
- 7 Department of Psychological Medicine, National University of Singapore , Singapore
| | - Fengyu Zhang
- 8 Lieber Institute for Brain Development, Johns Hopkins University , Baltimore, Maryland
| | - Jiehua Lu
- 9 Department of Sociology, Peking University , Beijing, China
| | - Jianxin Li
- 9 Department of Sociology, Peking University , Beijing, China
| | - Yang Li
- 10 Department of Human Population Genetics, Institute of Molecular Medicine, Peking University , Beijing, China
| | - Wei Tao
- 11 School of Life Sciences, Peking University , Beijing, China
| | - Simon G Gregory
- 12 Duke Molecular Physiology Institute, Duke University , Durham, North Carolina
| | - William Gottschalk
- 13 Department of Neurology, Medical Center, Duke University , Durham, North Carolina
| | - Michael W Lutz
- 13 Department of Neurology, Medical Center, Duke University , Durham, North Carolina
| | - Kenneth C Land
- 14 Population Research Institute, Duke University , Durham, North Carolina
| | - Anatoli Yashin
- 14 Population Research Institute, Duke University , Durham, North Carolina
| | - Qihua Tan
- 15 Biostatistics and Biodemography, Institute of Public Health, University of Southern Denmark , Odense, Denmark
| | - Ze Yang
- 16 National Institute of Geriatrics, Beijing Hospital , Ministry of Health of China, Beijing, China
| | - Lars Bolund
- 6 Beijing Genomics Institute (BGI)-Shenzhen , Shenzhen, China .,17 Department of Biomedicine, Aarhus University , Aarhus, Denmark
| | - Qi Ming
- 6 Beijing Genomics Institute (BGI)-Shenzhen , Shenzhen, China .,18 Center for Genetic & Genomic Medicine, Zhejiang University School of Medicine , Hangzhou, China
| | - Huanming Yang
- 6 Beijing Genomics Institute (BGI)-Shenzhen , Shenzhen, China .,19 James D. Watson Institute of Genome Sciences , Hangzhou, China .,20 Princess Al-Jawhara Centre of Excellence in Research of Hereditary Disorders, King Abdulaziz University , Jeddah, Saudi Arabia
| | - Junxia Min
- 21 School of Medicine, Zhejiang University , Hangzhou, China
| | - D Craig Willcox
- 22 Department of Human Welfare, Okinawa International University , Ginowan, Japan .,23 Department of Research, Kuakini Medical Center and Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawaii , Hawaii
| | - Bradley J Willcox
- 23 Department of Research, Kuakini Medical Center and Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawaii , Hawaii
| | - Jun Gu
- 11 School of Life Sciences, Peking University , Beijing, China
| | - Elizabeth Hauser
- 12 Duke Molecular Physiology Institute, Duke University , Durham, North Carolina
| | - Xiao-Li Tian
- 10 Department of Human Population Genetics, Institute of Molecular Medicine, Peking University , Beijing, China
| | - James W Vaupel
- 24 Max Planck Institute for Demographic Research , Rostock, Germany
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Morris J, Fang Y, De Mukhopdhyay K, Wargovich MJ. Natural Agents Used in Chemoprevention of Aerodigestive and GI Cancers. ACTA ACUST UNITED AC 2016; 2:11-20. [PMID: 27134816 DOI: 10.1007/s40495-016-0047-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Aerodigestive cancers are on an increasing level in both occurrence and mortality. A major cause in many of these cancers is disruption of the inflammatory pathway, leading to increased cell proliferation, and epigenetic silencing of normal regulatory genes. Here we review the research on several natural products: silibinin, silymarin, quercetin, neem & nimbolide, gingerol, epigallatecatechin-3- gallate, curcumin, genistein and resveratrol conducted on aerodigestive cancers. These types of cancers are primarily those from oral cavity, esophagus/windpipe, stomach, small and large intestine, colon/rectum and bile/pancreas tissues. We report on the utilization in vivo and in vitro systems to research these dose effects on the inflammatory and epigenetic pathway components within the aerodigestive cancer. To follow up on the basic research we will discuss remaining research questions and future directions involving these natural products as putative stand alone or in combination with clinical agents.
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Affiliation(s)
- Jay Morris
- Department of Molecular Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX 78229
| | - Yuan Fang
- Department of Molecular Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX 78229
| | - Keya De Mukhopdhyay
- Department of Molecular Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX 78229
| | - Michael J Wargovich
- Department of Molecular Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX 78229
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Pang J, Zhang Z, Zheng TZ, Bassig BA, Mao C, Liu X, Zhu Y, Shi K, Ge J, Yang YJ, Dejia-Huang, Bai M, Peng Y. Green tea consumption and risk of cardiovascular and ischemic related diseases: A meta-analysis. Int J Cardiol 2016; 202:967-74. [DOI: 10.1016/j.ijcard.2014.12.176] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/16/2014] [Accepted: 12/31/2014] [Indexed: 12/31/2022]
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Tea consumption and mortality of all cancers, CVD and all causes: a meta-analysis of eighteen prospective cohort studies. Br J Nutr 2015. [PMID: 26202661 DOI: 10.1017/s0007114515002329] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Epidemiological studies have demonstrated inconsistent associations between tea consumption and mortality of all cancers, CVD and all causes. To obtain quantitative overall estimates, we conducted a dose-response meta-analysis of prospective cohort studies. A literature search in PubMed and Embase up to April 2015 was conducted for all relevant papers published. Random-effects models were used to calculate pooled relative risks (RR) with 95 % CI. In eighteen prospective studies, there were 12 221, 11 306 and 55 528 deaths from all cancers, CVD and all causes, respectively. For all cancer mortality, the summary RR for the highest v. lowest category of green tea and black tea consumption were 1·06 (95 % CI 0·98, 1·15) and 0·79 (95 % CI 0·65, 0·97), respectively. For CVD mortality, the summary RR for the highest v. lowest category of green tea and black tea consumption were 0·67 (95 % CI 0·46, 0·96) and 0·88 (95 % CI 0·77, 1·01), respectively. For all-cause mortality, the summary RR for the highest v. lowest category of green tea and black tea consumption were 0·80 (95 % CI 0·68, 0·93) and 0·90 (95 % CI 0·83, 0·98), respectively. The dose-response analysis indicated that one cup per d increment of green tea consumption was associated with 5 % lower risk of CVD mortality and with 4 % lower risk of all-cause mortality. Green tea consumption was significantly inversely associated with CVD and all-cause mortality, whereas black tea consumption was significantly inversely associated with all cancer and all-cause mortality.
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Food Inhibits the Oral Bioavailability of the Major Green Tea Antioxidant Epigallocatechin Gallate in Humans. Antioxidants (Basel) 2015; 4:373-93. [PMID: 26783711 PMCID: PMC4665468 DOI: 10.3390/antiox4020373] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 05/06/2015] [Accepted: 05/18/2015] [Indexed: 01/05/2023] Open
Abstract
The bioavailability of the most abundant and most active green tea antioxidant, epigallocatechin gallate (EGCG) remains uncertain. Therefore, the systemic absorption of EGCG was tested in healthy fasted humans. It was administered as capsules with water or with a light breakfast, or when incorporated within a strawberry sorbet. The results for plasma EGCG clearly revealed that taking EGCG capsules without food was better; the AUC was 2.7 and 3.9 times higher than when EGCG capsules were taken with a light breakfast (p = 0.044) or with EGCG imbedded in the strawberry sorbet (p = 0.019), respectively. This pattern was also observed for Cmax and Cav. Therefore, ingesting food at the same time as EGCG, whether it was imbedded or not in food, substantially inhibited the absorption of the catechin. As with some types of medications that are affected by food, it appears that EGCG should be taken without food in order to maximise its systemic absorption. Therefore, based on these findings, ingesting EGCG with water on an empty stomach is the most appropriate method for the oral delivery of EGCG in clinical trials where EGCG is to be investigated as a potential bioactive nutraceutical in humans.
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Saito E, Inoue M, Sawada N, Shimazu T, Yamaji T, Iwasaki M, Sasazuki S, Noda M, Iso H, Tsugane S. Association of green tea consumption with mortality due to all causes and major causes of death in a Japanese population: the Japan Public Health Center-based Prospective Study (JPHC Study). Ann Epidemiol 2015; 25:512-518.e3. [PMID: 25900254 DOI: 10.1016/j.annepidem.2015.03.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 02/26/2015] [Accepted: 03/02/2015] [Indexed: 10/23/2022]
Abstract
PURPOSE We examined the association between green tea consumption and mortality due to all causes, cancer, heart disease, cerebrovascular disease, respiratory disease, injuries, and other causes of death in a large-scale population-based cohort study in Japan. METHODS We studied 90,914 Japanese (aged between 40 and 69 years) recruited between 1990 and 1994. After 18.7 years of follow-up, 12,874 deaths were reported. The association between green tea consumption and risk of all causes and major causes of mortality was assessed using the Cox proportional hazards regression model with adjustment for potential confounders. RESULTS Hazard ratios for all-cause mortality among men who consumed green tea compared with those who drank less than 1 cup/day were 0.96 (0.89-1.03) for 1-2 cups/day, 0.88 (0.82-0.95) for 3-4 cups/day, and 0.87 (0.81-0.94) for more than 5 cups/day (P for trend <.001). Corresponding hazard ratios for women were 0.90 (0.81-1.00), 0.87 (0.79-0.96), and 0.83 (0.75-0.91; P for trend <.001). Green tea was inversely associated with mortality from heart disease in both men and women and mortality from cerebrovascular disease and respiratory disease in men. No association was found between green tea and total cancer mortality. CONCLUSIONS This prospective study suggests that the consumption of green tea may reduce the risk of all-cause mortality and the three leading causes of death in Japan.
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Affiliation(s)
- Eiko Saito
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan; Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Manami Inoue
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan; Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
| | - Norie Sawada
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Taichi Shimazu
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Taiki Yamaji
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Motoki Iwasaki
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Shizuka Sasazuki
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Mitsuhiko Noda
- Department of Diabetes Research, Diabetes Research Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Hiroyasu Iso
- Public Health, Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, Suita, Osaka-fu, Japan
| | - Shoichiro Tsugane
- Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
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Tea consumption and risk of cardiovascular outcomes and total mortality: a systematic review and meta-analysis of prospective observational studies. Eur J Epidemiol 2014; 30:103-13. [DOI: 10.1007/s10654-014-9960-x] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 10/15/2014] [Indexed: 10/24/2022]
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Espinosa C, Pérez-Llamas F, Guardiola FA, Esteban MA, Arnao MB, Zamora S, López-Jiménez JA. Molecular mechanisms by which white tea prevents oxidative stress. J Physiol Biochem 2014; 70:891-900. [PMID: 25255956 DOI: 10.1007/s13105-014-0357-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 09/05/2014] [Indexed: 01/24/2023]
Abstract
The flavonoid content of tea (Camellia sinensis) has beneficial properties in the prevention of diseases. However, the mechanisms by which white tea can protect against oxidative stress remain unclear. To shed light on this issue, rats were given distilled water (controls), 0.15 mg/day (dose 1) or 0.45 mg/day (dose 2) of solid tea extract/kg body weight for 12 months. All the animals received an injection of adriamycin (ADR; 10 mg/kg body weight), except half of the control group, which were given an injection of saline solution. The expression of the nuclear factor, E2-related factor 2 (Nrf2), NAD(P)H:quinone oxidoreductase 1 (Nqo1), glutathione S-transferase (Gst), haem oxygenase-1 (Ho1), catalase (Cat), superoxide dismutase (Sod) and glutathione reductase (Gr) in liver was analysed by real-time PCR, and the activity of catalase (CAT), superoxide dismutase (SOD) and glutathione reductase (GR) was measured spectrophotometrically. ADR significantly increased the expression of Nrf2, Gst, Nqo1, Ho1, Cat, Sod and Gr with respect to the control levels and also increased the activity of CAT, SOD and GR. The intake of white tea increased in a higher degree the expression of Nrf2, Gst, Nqo1 and Ho1 in the tea + ADR group compared with the control group and C + ADR group. In addition, tea + ADR groups decreased the expression and activity of CAT, SOD and GR in a dose-dependent manner.
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Affiliation(s)
- C Espinosa
- Department of Physiology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, Campus de Espinardo, 30100, Murcia, Spain,
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Acute ingestion of catechin-rich green tea improves postprandial glucose status and increases serum thioredoxin concentrations in postmenopausal women. Br J Nutr 2014; 112:1542-50. [PMID: 25230741 DOI: 10.1017/s0007114514002530] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Elevated postprandial hyperglycaemia and oxidative stress increase the risks of type 2 diabetes and CVD. Green tea catechin possesses antidiabetic properties and antioxidant capacity. In the present study, we examined the acute and continuous effects of ingestion of catechin-rich green tea on postprandial hyperglycaemia and oxidative stress in healthy postmenopausal women. Participants were randomly assigned into the placebo (P, n 11) or green tea (GT, n 11) group. The GT group consumed a catechin-rich green tea (catechins 615 mg/350 ml) beverage per d for 4 weeks. The P group consumed a placebo (catechins 92 mg/350 ml) beverage per d for 4 weeks. At baseline and after 4 weeks, participants of each group consumed their designated beverages with breakfast and consumed lunch 3 h after breakfast. Venous blood samples were collected in the fasted state (0 h) and at 2, 4 and 6 h after breakfast. Postprandial glucose concentrations were 3 % lower in the GT group than in the P group (three-factor ANOVA, group × time interaction, P< 0·05). Serum concentrations of the derivatives of reactive oxygen metabolites increased after meals (P< 0·05), but no effect of catechin-rich green tea intake was observed. Conversely, serum postprandial thioredoxin concentrations were 5 % higher in the GT group than in the P group (three-factor ANOVA, group × time interaction, P< 0·05). These findings indicate that an acute ingestion of catechin-rich green tea has beneficial effects on postprandial glucose and redox homeostasis in postmenopausal women.
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Hao G, Li W, Teo K, Wang X, Yang J, Wang Y, Liu L, Yusuf S. Influence of tea consumption on acute myocardial infarction in China population: the INTERHEART China study. Angiology 2014; 66:265-70. [PMID: 24755694 DOI: 10.1177/0003319714531849] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We assessed the association between tea consumption and acute myocardial infarction (AMI) using INTERHEART China data. Cases (n = 2909) and controls (n = 2947) were randomly selected and frequency matched by age and sex. Participants who drank tea ≥4 cups/d had a significantly higher risk of AMI than tea nondrinkers; odds ratio (OR) was 1.29 (95% confidence interval [CI]: 1.03-1.61) compared with tea nondrinkers. A similar trend was found in green tea drinkers; OR was 1.52 (95% CI: 1.13-2.05) in the participants who drank 3 cups/d and 1.73 (95% CI: 1.35-2.22) in the participants who drank ≥4 cups/d compared with tea nondrinkers. We also found that green tea consumption had a greater effect on females; OR was 2.80 (95% CI: 1.43-5.50) in females. In conclusion, we found that the risk of AMI increases as tea consumption increases. Further studies are needed to confirm this association.
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Affiliation(s)
- Guang Hao
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Wei Li
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Koon Teo
- Population Health Research Institute, McMaster University, Hamilton, Canada
| | - Xingyu Wang
- Beijing Hypertension League Institute, Beijing, China
| | - Jingang Yang
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Yang Wang
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Lisheng Liu
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China Beijing Hypertension League Institute, Beijing, China
| | - Salim Yusuf
- Population Health Research Institute, McMaster University, Hamilton, Canada
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Yuan JM. Cancer prevention by green tea: evidence from epidemiologic studies. Am J Clin Nutr 2013; 98:1676S-1681S. [PMID: 24172305 PMCID: PMC3831544 DOI: 10.3945/ajcn.113.058271] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In contrast to the consistent results of an inhibitory effect of green tea extracts and tea polyphenols on the development and growth of carcinogen-induced tumors in experimental animal models, results from human studies are mixed. Both observational and intervention studies have provided evidence in support of a protective role of green tea intake in the development of oral-digestive tract cancer or an inhibitory role of oral supplementation of green tea extract on a precancerous lesion of oral cavity. Evidence in support of green tea intake against the development of liver cancer risk is limited and inconsistent. An inverse association between green tea intake and lung cancer risk has been observed among never smokers but not among smokers. Although observational studies do not support a beneficial role of tea intake against the development of prostate cancer, several phase 2 clinical trials have shown an inhibitory effect of green tea extract against the progression of prostate premalignant lesions to malignant tumors. Prospective epidemiologic studies so far have not provided evidence for a protective effect of green tea consumption on breast cancer development. Current data neither confirm nor refute a definitive cancer-preventive role of green tea intake. Large randomized intervention trials on the efficacy of green tea polyphenols or extracts are required before a recommendation for green tea consumption for cancer prevention should be made.
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Affiliation(s)
- Jian-Min Yuan
- University of Pittsburgh Cancer Institute and Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA
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46
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Ruan R, Feng L, Li J, Ng TP, Zeng Y. Tea consumption and mortality in the oldest-old Chinese. J Am Geriatr Soc 2013; 61:1937-42. [PMID: 24117374 DOI: 10.1111/jgs.12498] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To investigate the association between tea consumption and mortality in the oldest-old Chinese. DESIGN Population-based longitudinal data from the Chinese Longitudinal Healthy Longevity Survey (CLHLS) were analyzed using a Cox semiparametric proportional hazard model. SETTING Six hundred thirty-one randomly selected counties and cities of China's 22 provinces. PARTICIPANTS Individuals aged 80 and older (N = 9,093) who provided complete data in the baseline survey (1998). MEASUREMENTS Self-reported current frequency of tea drinking and past frequency at approximately age 60 were ascertained at baseline survey; a follow-up survey was conducted 2000, 2002, and 2005. RESULTS In the oldest-old Chinese, tea consumption was associated with lower risk of mortality after adjusting for demographic characteristics, socioeconomic status, health practices, and health status. Compared with non-tea drinkers, the adjusted hazard ratio (HR) was 0.90 (95% confidence interval (CI) = 0.84-0.96) for daily tea drinkers (at the baseline survey, 1998) and 1.00 (95% CI = 1.01-1.07) for occasional tea drinkers (P for linear trend .003). Similar results were found when tea drinking status at age 60 was used in the analysis. Further analysis showed that subjects who reported frequent tea drinking at age 60 and at the baseline survey had a 10% lower risk of mortality than subjects who reported infrequent tea drinking at age 60 and at the baseline survey (HR = 0.90, 95% CI = 0.84-0.97). CONCLUSION Tea consumption is associated with lower risk of mortality in the oldest-old Chinese.
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Affiliation(s)
- Rongping Ruan
- School of Agricultural Economics and Rural Development, Renmin University of China, Beijing, China
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47
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van Meer S, Leufkens AM, Bueno-de-Mesquita HB, van Duijnhoven FJB, van Oijen MGH, Siersema PD. Role of dietary factors in survival and mortality in colorectal cancer: a systematic review. Nutr Rev 2013; 71:631-41. [PMID: 24032367 DOI: 10.1111/nure.12042] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The role of dietary factors in the outcome of colorectal cancer (CRC) has been the subject of many studies, but results are inconclusive. Presented here are the results of a systematic review of studies published on dietary factors and CRC outcome in the English literature between March 2002 and March 2012. Studies were subdivided into survival studies in CRC patients and CRC mortality studies in the general population. Sixteen of the 636 studies identified--5 on survival and 11 on mortality--met the predefined inclusion criteria. No consistent association between individual dietary components and CRC outcome was detected in the survival studies. In the mortality studies, an association between meat intake and increased CRC mortality was found in two ecologic studies; however, two prospective cohort studies did not confirm this association. An inverse association between cereal intake and CRC mortality was found in two ecologic studies. In conclusion, published studies investigating dietary factors and outcome in CRC are heterogeneous in design and findings. No dietary component was conclusively and consistently associated with survival in CRC patients. The results of mortality studies seem to indicate that meat intake has an adverse effect on CRC mortality, while cereal intake may be protective.
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Affiliation(s)
- Suzanne van Meer
- Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, The Netherlands
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48
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Gardener H, Rundek T, Wright CB, Elkind MSV, Sacco RL. Coffee and tea consumption are inversely associated with mortality in a multiethnic urban population. J Nutr 2013; 143:1299-308. [PMID: 23784068 PMCID: PMC3709994 DOI: 10.3945/jn.112.173807] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Coffee and tea are commonly consumed beverages. Inverse associations with mortality have been suggested for coffee and tea, but the relationships with cause-specific mortality are not well understood. We examined regular and decaffeinated coffee and tea in relation to mortality due to all causes, vascular, nonvascular, and cancer in the multi-ethnic, prospective, population-based Northern Manhattan Study. The study population included 2461 participants with diet data who were free of stroke, myocardial infarction, and cancer at baseline (mean age 68.30 ± 10.23 y, 36% men, 19% white, 23% black, 56% Hispanic). During a mean follow-up of 11 y, we examined the associations between coffee and tea consumption, assessed by food frequency questionnaire, and 863 deaths (342 vascular related and 444 nonvascular including 160 cancer deaths) using multivariable-adjusted Cox models. Coffee consumption was inversely associated with all-cause mortality [for each additional cup/d, HR = 0.93 (95% CI: 0.88, 0.99); P = 0.02]. Caffeinated coffee was inversely associated with all-cause mortality, driven by a strong protection among those who drank ≥4 cups/d. An inverse dose-response relationship between tea and all-cause mortality was suggested [for each additional cup/d, HR = 0.91 (95% CI: 0.84, 0.99); P = 0.01]. Coffee consumption ≥4/d was protective against nonvascular death [vs. <1/mo, HR = 0.57 (95% CI: 0.33, 0.97)] and tea consumption ≥2/d was protective against nonvascular death [HR = 0.63 (95% CI: 0.41, 0.95)] and cancer [HR = 0.33 (95% CI: 0.14, 0.80)]. There was a strong inverse association between coffee and vascular-related mortality among Hispanics only. Further study is needed, including investigation into the mechanisms and compounds in coffee and tea responsible for the inverse associations with mortality. The differential relationship between coffee and vascular death across race/ethnicity underscores the need for research in similar multi-ethnic cohorts including Hispanics.
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Affiliation(s)
- Hannah Gardener
- Department of Neurology, Miller School of Medicine, University of Miami, Miami, FL, USA.
| | - Tatjana Rundek
- Department of Neurology, Miller School of Medicine, University of Miami, Miami, FL; and
| | - Clinton B. Wright
- Department of Neurology, Miller School of Medicine, University of Miami, Miami, FL; and
| | - Mitchell S. V. Elkind
- Department of Neurology, Columbia University College of Physicians and Surgeons, New York, NY
| | - Ralph L. Sacco
- Department of Neurology, Miller School of Medicine, University of Miami, Miami, FL; and
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Mannu GS, Zaman MJS, Gupta A, Rehman HU, Myint PK. Evidence of lifestyle modification in the management of hypercholesterolemia. Curr Cardiol Rev 2013; 9:2-14. [PMID: 22998604 PMCID: PMC3584303 DOI: 10.2174/157340313805076313] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 08/26/2012] [Accepted: 10/13/2012] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Coronary heart disease (CHD) is the leading cause of morbidity and mortality worldwide. The growth of ageing populations in developing countries with progressively urbanized lifestyles are major contributors. The key risk factors for CHD such as hypercholesterolemia, diabetes mellitus, and obesity are likely to increase in the future. These risk factors are modifiable through lifestyle. OBJECTIVES To review current literature on the potential benefit of cholesterol lowering in CHD risk reduction with a particular focus on the evidence of non-pharmacological/lifestyle management of hypercholesterolemia. METHODS Medline/PubMed systematic search was conducted using a two-tier approach limited to all recent English language papers. Primary search was conducted using key words and phrases and all abstracts were subsequently screened and relevant papers were selected. The next tier of searching was conducted by (1) reviewing the citation lists of the selected papers and (2) by using PubMed weblink for related papers. Over 3600 reports were reviewed. RESULTS Target cholesterol levels set out in various guidelines could be achieved by lifestyle changes, including diet, weight reduction, and increased physical activity with the goal of reducing total cholesterol to <200 mg/dL and LDL-C<100 mg/dL. Various dietary constituents such as green tea, plant sterols, soy protein have important influences on total cholesterol. Medical intervention should be reserved for those patients who have not reached this goal after 3 months of non-pharmacological approach. CONCLUSION CHD remains as a leading cause of death worldwide and hypercholesterolemia is an important cause of CHD. Non-pharmacological methods provide initial as well as long-term measures to address this issue.
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Affiliation(s)
- G S Mannu
- Medicine and Biochemistry, C/o Level 2, MFE Offices, Norfolk and Norwich University Hospital, Norwich, NR4 7UY, UK.
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50
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Thermally-induced β-lactoglobulin–EGCG nanovehicles: Loading, stability, sensory and digestive-release study. Food Hydrocoll 2012. [DOI: 10.1016/j.foodhyd.2012.01.016] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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