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Fukunaga A, Jimba M, Pham TTP, Nguyen CQ, Hoang DV, Phan TV, Yazawa A, Phan DC, Hachiya M, Le HX, Do HT, Mizoue T, Inoue Y. Association of green tea consumption with prediabetes, diabetes and markers of glucose metabolism in rural Vietnam: a cross-sectional study. Br J Nutr 2024; 131:1883-1891. [PMID: 38361457 DOI: 10.1017/s0007114524000412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
The literature on green tea consumption and glucose metabolism has reported conflicting findings. This cross-sectional study examined the association of green tea consumption with abnormal glucose metabolism among 3000 rural residents aged 40-60 years in Khánh Hòa province in Vietnam. Multinomial logistic regression analysis was conducted to examine the association of green tea consumption (0, < 200, 200-< 400, 400-< 600 or ≥ 600 ml/d) with prediabetes and diabetes (based on the American Diabetes Association criteria). Linear regression analysis was performed to examine the association between green tea consumption and the log-transformed homeostatic model assessment of insulin resistance (HOMA-IR) (a marker of insulin resistance) and the log-transformed homeostatic model assessment of β-cell function (HOMA-β) (a marker of insulin secretion). The OR for prediabetes and diabetes among participants who consumed ≥ 600 ml/d v. those who did not consume green tea were 1·61 (95 % CI = 1·07, 2·42) and 2·04 (95 % CI = 1·07, 3·89), respectively. Higher green tea consumption was associated with a higher level of log-transformed HOMA-IR (Pfor trend = 0·04) but not with a lower level of log-transformed HOMA-β (Pfor trend = 0·75). Higher green tea consumption was positively associated with the prevalence of prediabetes, diabetes and insulin resistance in rural Vietnam. The findings of this study indicated prompting the need for further research considering context in understanding the link between green tea consumption and glucose metabolism, especially in rural settings in low- and middle-income countries.
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Affiliation(s)
- Ami Fukunaga
- Department of Community and Global Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Department of Epidemiology and Prevention, National Center for Global Health and Medicine, Tokyo, Japan
| | - Masamine Jimba
- Department of Community and Global Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Thuy Thi Phuong Pham
- Department of Non-communicable Disease Control and Nutrition, Pasteur Institute in Nha Trang, Nha Trang, Khánh Hòa, Vietnam
| | - Chau Que Nguyen
- Department of Non-communicable Disease Control and Nutrition, Pasteur Institute in Nha Trang, Nha Trang, Khánh Hòa, Vietnam
| | - Dong Van Hoang
- Department of Epidemiology and Prevention, National Center for Global Health and Medicine, Tokyo, Japan
| | - Tien Vu Phan
- Medical Service Center, Pasteur Institute in Nha Trang, Nha Trang, Khánh Hòa, Vietnam
| | - Aki Yazawa
- Department of Epidemiology and Prevention, National Center for Global Health and Medicine, Tokyo, Japan
- Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public Health, BostonMA, USA
| | - Danh Cong Phan
- Department of Non-communicable Disease Control and Nutrition, Pasteur Institute in Nha Trang, Nha Trang, Khánh Hòa, Vietnam
| | - Masahiko Hachiya
- Bureau of International Health Cooperation, National Center for Global Health and Medicine, Tokyo, Japan
| | - Huy Xuan Le
- Pasteur Institute in Nha Trang, Khánh Hòa, Vietnam
| | - Hung Thai Do
- Pasteur Institute in Nha Trang, Khánh Hòa, Vietnam
| | - Tetsuya Mizoue
- Department of Epidemiology and Prevention, National Center for Global Health and Medicine, Tokyo, Japan
| | - Yosuke Inoue
- Department of Epidemiology and Prevention, National Center for Global Health and Medicine, Tokyo, Japan
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Kotzé-Hörstmann LM, Sadie-Van Gijsen H. Modulation of Glucose Metabolism by Leaf Tea Constituents: A Systematic Review of Recent Clinical and Pre-clinical Findings. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:2973-3005. [PMID: 32105058 DOI: 10.1021/acs.jafc.9b07852] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Leaf teas are widely used as a purported treatment for dysregulated glucose homeostasis. The objective of this study was to systematically evaluate the clinical and cellular-metabolic evidence, published between January 2013 and May 2019, and indexed on PubMed, ScienceDirect, and Web of Science, supporting the use of leaf teas for this purpose. Fourteen randomized controlled trials (RCTs) (13 on Camellia sinensis teas) were included, with mixed results, and providing scant mechanistic information. In contrast, 74 animal and cell culture studies focusing on the pancreas, liver, muscle, and adipose tissue yielded mostly positive results and highlighted enhanced insulin signaling as a recurring target associated with the effects of teas on glucose metabolism. We conclude that more studies, including RCTs and pre-clinical studies examining teas from a wider variety of species beyond C. sinensis, are required to establish a stronger evidence base on the use of leaf teas to normalize glucose metabolism.
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Affiliation(s)
- Liske M Kotzé-Hörstmann
- Centre for Cardio-metabolic Research in Africa (CARMA), Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University Tygerberg Campus, Parow 7505, South Africa
| | - Hanél Sadie-Van Gijsen
- Centre for Cardio-metabolic Research in Africa (CARMA), Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University Tygerberg Campus, Parow 7505, South Africa
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Antidiabetic Effects of Tea. Molecules 2017; 22:molecules22050849. [PMID: 28531120 PMCID: PMC6154530 DOI: 10.3390/molecules22050849] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 05/13/2017] [Accepted: 05/18/2017] [Indexed: 12/30/2022] Open
Abstract
Diabetes mellitus (DM) is a chronic endocrine disease resulted from insulin secretory defect or insulin resistance and it is a leading cause of death around the world. The care of DM patients consumes a huge budget due to the high frequency of consultations and long hospitalizations, making DM a serious threat to both human health and global economies. Tea contains abundant polyphenols and caffeine which showed antidiabetic activity, so the development of antidiabetic medications from tea and its extracts is increasingly receiving attention. However, the results claiming an association between tea consumption and reduced DM risk are inconsistent. The advances in the epidemiologic evidence and the underlying antidiabetic mechanisms of tea are reviewed in this paper. The inconsistent results and the possible causes behind them are also discussed.
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