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Validation of the 24-hour perceived exertion recall survey (PERS) in women in rural Tigray, Ethiopia. Curr Dev Nutr 2023. [PMID: 37547061 PMCID: PMC10401292 DOI: 10.1016/j.cdnut.2023.100064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023] Open
Abstract
Background Physical activity affects nutritional status and health. Currently, there are few validated survey tools for estimating physical activity in rural areas of low-income countries, including Ethiopia, which limits the ability of researchers to assess how physical activity affects nutritional status. Objectives This study used accelerometry to validate 2 in-person questionnaires, the global physical activity questionnaire (GPAQ) and the 24-h perceived exertion recall survey (PERS). Methods This study recruited 180 women aged between 18 and 45 y living in rural Tigray, Ethiopia. Participants had previously participated in an impact evaluation of a public work safety net. They wore an accelerometer for 8 d and responded to perceived exertion questionnaires twice. Data were collected on 89 women during the short rainy period and 91 women during the main rainy season. A survey method was considered valid if the proportion of time spent in moderate or vigorous physical activity (MVPA) levels had a Pearson's correlation coefficient of >0.40 to the proportion of time spent in MVPA recorded by accelerometry. Results The GPAQ had high reliability, but the overall validity was poorer than accelerometry. The proportion of time spent in MVPA according to the accelerometer was associated with discordance between GPAQ and accelerometry. MVPA levels, as measured by the 24-h PERS, had a fair agreement with accelerometry. The agreement increased to moderate/acceptable when adjusted for season and BMI. Conclusions The 24-h PERS is a valid tool for estimating the physical activity of women living in rural highland Ethiopia. It can be used in future research to understand the physical activity demands of living in rural highland Ethiopia, enabling more targeted programs to address undernutrition.
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Fuse Y, Tsukada N, Urakawa Y, Yokoyama J, Matsuzaki M, Shishiba Y, Irie M. Studies on urinary excretion and variability of dietary iodine in healthy Japanese adults. Endocr J 2022; 69:427-440. [PMID: 34789603 DOI: 10.1507/endocrj.ej21-0486] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The daily consumption of iodine in Japan is higher than in most countries, and there are few reports on iodine metabolism and variance of habitual iodine ingestion in an iodine-sufficient area. To elucidate the patterns of short-term urinary iodine excretion (UIE) and long-term variability of habitual iodine intake, the urinary iodine excretion process after a high dietary iodine load of 3 mg was observed in eight Japanese adults under strict supervision with complete urine collections for three days. In addition, estimated UIE and dietary iodine intake (DII) were assessed in 24 university students using repeated spot urine samples of ten consecutive days and a food frequency questionnaire in each of the four seasons. Approximately 50, 75 and 90% of orally ingested iodine was excreted into the urine at 8, 13 and 22 hours after ingestion, respectively. Almost an equal amount of ingested iodine in meals was cleared within 33.5 h after eating with a maximum excretion rate at 3-4 h. There was a high fluctuation in the UIE and DII in the university students. The intra- and inter-individual crude coefficients of variation were 123 or 294.7% for UIE, and 58.3 or 88.7% for DII, respectively, indicating a higher variance of habitual iodine intake than in other countries. The frequency of occurrence for UIE above 3 mg was every 43 days. Rapid renal clearance of iodine and high variability as well as low frequency of dietary iodine intake might prevent people from being exposed to an excess iodine intake over the long term in Japan.
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Affiliation(s)
- Yozen Fuse
- Research Committee on Iodine Related Health Problems, Foundation for Growth Science, Tokyo 113-0033, Japan
| | - Nobu Tsukada
- Kagawa Nutrition University, Institute of Nutrition Sciences, Saitama 350-0288, Japan
| | | | | | | | - Yoshimasa Shishiba
- Research Committee on Iodine Related Health Problems, Foundation for Growth Science, Tokyo 113-0033, Japan
| | - Minoru Irie
- Research Committee on Iodine Related Health Problems, Foundation for Growth Science, Tokyo 113-0033, Japan
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Singh PK, Ahmad N, Yamini S, Singh RP, Singh AK, Sharma P, Smith ML, Sharma S, Singh TP. Structural evidence of the oxidation of iodide ion into hyper-reactive hypoiodite ion by mammalian heme lactoperoxidase. Protein Sci 2022; 31:384-395. [PMID: 34761444 PMCID: PMC8819834 DOI: 10.1002/pro.4230] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 11/04/2021] [Accepted: 11/05/2021] [Indexed: 02/03/2023]
Abstract
Lactoperoxidase (1.11.1.7, LPO) is a mammalian heme peroxidase found in the extracellular fluids of mammals including plasma, saliva, airway epithelial lining fluids, nasal lining fluid, milk, tears, gastric juices, and intestinal mucosa. To perform its innate immune action against invading microbes, LPO utilizes hydrogen peroxide (H2 O2 ) to convert thiocyanate (SCN- ) and iodide (I- ) ions into the oxidizing compounds hypothiocyanite (OSCN- ) and hypoiodite (IO- ). Previously determined structures of the complexes of LPO with SCN- , OSCN- , and I- show that SCN- and I- occupy appropriate positions in the distal heme cavity as substrates while OSCN- binds in the distal heme cavity as a product inhibitor. We report here the structure of the complex of LPO with IO- as the first structural evidence of the conversion of iodide into hypoiodite by LPO. To obtain this complex, a solution of LPO was first incubated with H2 O2 , then mixed with ammonium iodide solution and the complex crystallized by the addition of PEG-3350, 20% (wt/vol). These crystals were used for X-ray intensity data collection and structure analysis. The structure determination revealed the presence of four hypoiodite ions in the substrate binding channel of LPO. In addition to these, six other hypoiodite ions were observed at different exterior sites. We surmise that the presence of hypoiodite ions in the distal heme cavity blocks the substrate binding site and inhibits catalysis. This was confirmed by activity experiments with the colorimetric substrate, ABTS (2,2'-azino-bis(3-ethylbenzthiazoline-sulfonic acid)), in the presence of hypoiodite and iodide ions.
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Affiliation(s)
- Prashant K. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Nayeem Ahmad
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Shavait Yamini
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Rashmi P. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Amit K. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Pradeep Sharma
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | | | - Sujata Sharma
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Tej P. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
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Smith ML, Sharma S, Singh TP. Comments on the Discussion Forum: Oromucosal immunomodulation as clinical spectrum mitigating factor in SARS-CoV-2 infection. Scand J Immunol 2021; 95:e13111. [PMID: 34709678 PMCID: PMC8646740 DOI: 10.1111/sji.13111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 10/04/2021] [Accepted: 10/20/2021] [Indexed: 11/28/2022]
Abstract
The mammalian lactoperoxidase system, consisting of lactoperoxidase and the H2O2‐producing enzyme duox, is our first line of defence against airborne microbes. This system catalyses the production of hypoiodite and hypoiodous acid in the presence of sufficient iodine. These products are highly efficient at destroying the H1N1 virus and the respiratory syncytial virus (RSV). Japan has not been affected as much as other nations during the COVID‐19 pandemic (death rate about 10% of the United States), and we think this is due to a diet high in iodine. With this in mind, we suggest four actions to prevent SARS‐CoV‐2 infections. First, health professionals should study the preventative effect of increasing iodine in the diets of the aged, institutionalized, diabetics andsmokers. Second, the recommended daily intake (RDI) for iodine should be significantly increased, to at least double, the current RDI. Governments should encourage the use and distribution of cheap iodized salts, kelp and seaweed. Third, more research should be done around the physiology and the protective effects of the lactoperoxidase system. Finally, the degradation products of the SARS‐CoV‐2 viral particle by hypoiodite and hypoiodous acid should be characterized; portions of the damaged particle are likely to elicit stronger immunity and better vaccines.
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Affiliation(s)
- Michael L Smith
- Department of Molecular Biology, Umeå University, Umeå, Sweden
| | - Sujata Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Tej P Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
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5
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Choi JY, Lee JH, Song Y. Evaluation of Iodine Status among Korean Patients with Papillary Thyroid Cancer Using Dietary and Urinary Iodine. Endocrinol Metab (Seoul) 2021; 36:607-618. [PMID: 34154044 PMCID: PMC8258329 DOI: 10.3803/enm.2021.1005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/26/2021] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Concerns have been raised regarding thyroid disorders caused by excessive iodine in Koreans, who have iodine-rich diets. This study evaluated iodine status using dietary iodine intake and urinary iodine in papillary thyroid cancer (PTC) patients. METHODS Dietary data of PTC patients were assessed using a 24-hour recall and food frequency questionnaire (FFQ), and urinary iodine concentrations (UICs) were also obtained. To compare the iodine status of PTC patients, Korean adults with or without thyroid disease from the Korea National Health and Nutrition Examination Survey, which had 24-hour recall data and urinary iodine measurements, were analyzed. RESULTS The median daily iodine intake by 24-hour recall was 341.7 μg/day in PTC patients, similar to the levels of other Korean adults. Based on UICs, the prevalence of excessive iodine was 54.4% in PTC patients, which was similar to the prevalence among subjects with thyroid disease (55.4%) but slightly higher than that in subjects without thyroid disease (47.7%). Based on dietary iodine by 24-hour recall, the prevalence of excessive iodine intake was 7.2%, which was higher than that among subjects with (4.4%) or without (3.9%) thyroid disease. The dietary iodine intake based on 24-hour recall was closely correlated with the UIC (r=0.4826) in PTC patients, but dietary iodine by FFQ was not significantly correlated with either 24-hour recall or UIC-based dietary iodine. CONCLUSION Excessive iodine intake was more common in PTC patients than in subjects without thyroid disease. Further longitudinal research is necessary to elucidate the role of dietary iodine in PTC.
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Affiliation(s)
- Ji Yeon Choi
- Department of Food Science & Nutrition, The Catholic University of Korea, Bucheon,
Korea
| | - Joon-Hyop Lee
- Department of Surgery, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon,
Korea
| | - YoonJu Song
- Department of Food Science & Nutrition, The Catholic University of Korea, Bucheon,
Korea
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French CD, Arsenault JE, Arnold CD, Haile D, Luo H, Dodd KW, Vosti SA, Slupsky CM, Engle-Stone R. Within-Person Variation in Nutrient Intakes across Populations and Settings: Implications for the Use of External Estimates in Modeling Usual Nutrient Intake Distributions. Adv Nutr 2021; 12:429-451. [PMID: 33063105 PMCID: PMC8262514 DOI: 10.1093/advances/nmaa114] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 08/20/2020] [Accepted: 08/24/2020] [Indexed: 12/22/2022] Open
Abstract
Determining the proportion of a population at risk of inadequate or excessive nutrient intake is a crucial step in planning and managing nutrition intervention programs. Multiple days of 24-h dietary intake data per subject allow for adjustment of modeled usual nutrient intake distributions for the proportion of total variance in intake attributable to within-individual variation (WIV:total). When only single-day dietary data are available, an external adjustment factor can be used; however, WIV:total may vary by population, and use of incorrect WIV:total ratios may influence the accuracy of prevalence estimates and subsequent program impacts. WIV:total values were compiled from publications and from reanalyses of existing datasets to describe variation in WIV:total across populations and settings. The potential impact of variation in external WIV:total on estimates of prevalence of inadequacy was assessed through simulation analyses using the National Cancer Institute 1-d method. WIV:total values were extracted from 40 publications from 24 countries, and additional values were calculated from 15 datasets from 12 nations. Wide variation in WIV:total (from 0.02 to 1.00) was observed in publications and reanalyses. Few patterns by population characteristics were apparent, but WIV:total varied by age in children (< vs. >1 y) and between rural and urban settings. Simulation analyses indicated that estimates of the prevalence of inadequate intake are sensitive to the selected ratio in some cases. Selection of an external WIV:total estimate should consider comparability between the reference and primary studies with regard to population characteristics, study design, and statistical methods. Given wide variation in observed ratios with few discernible patterns, the collection of ≥2 days of intake data in at least a representative subsample in population dietary studies is strongly encouraged. In the case of single-day dietary studies, sensitivity analyses are recommended to determine the robustness of prevalence estimates to changes in the variance ratio.
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Affiliation(s)
- Caitlin D French
- Department of Nutrition, University of
California, Davis, Davis, CA, USA
- Institute for Global Nutrition, University of
California, Davis, CA, USA
| | - Joanne E Arsenault
- Intake–Center for Dietary Assessment, FHI
Solutions, Washington, DC, USA
| | - Charles D Arnold
- Institute for Global Nutrition, University of
California, Davis, CA, USA
| | - Demewoz Haile
- Department of Nutrition, University of
California, Davis, Davis, CA, USA
- Institute for Global Nutrition, University of
California, Davis, CA, USA
| | - Hanqi Luo
- Department of Nutrition, University of
California, Davis, Davis, CA, USA
- Institute for Global Nutrition, University of
California, Davis, CA, USA
| | - Kevin W Dodd
- National Cancer Institute, National Institutes of
Health, Rockville, MD, USA
| | - Stephen A Vosti
- Department of Agricultural and Resource Economics, University
of California, Davis, CA, USA
| | - Carolyn M Slupsky
- Department of Nutrition, University of
California, Davis, Davis, CA, USA
- Department of Food Science and Technology, University of
California, Davis, Davis, CA, USA
| | - Reina Engle-Stone
- Department of Nutrition, University of
California, Davis, Davis, CA, USA
- Institute for Global Nutrition, University of
California, Davis, CA, USA
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Katagiri R, Asakura K, Uechi K, Masayasu S, Sasaki S. Iodine Excretion in 24-hour Urine Collection and Its Dietary Determinants in Healthy Japanese Adults. J Epidemiol 2016; 26:613-621. [PMID: 27374137 PMCID: PMC5121429 DOI: 10.2188/jea.je20150245] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Accepted: 01/05/2016] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Since seaweed is a common component of the Japanese diet, iodine intake in Japanese is expected to be high. However, urinary iodine excretion, measured using 24-hour urine samples, and its dietary determinants are not known. METHODS Apparently healthy adults aged 20 to 69 years living in 20 areas throughout Japan were recruited in February and March, 2013. Urinary iodine excretion was evaluated using 24-hour urine collected from 713 subjects (362 men and 351 women), and the difference among age groups was assessed. The association between dietary intake of food groups and urinary iodine excretion was assessed among 358 subjects who completed a semi-weighed 4-day diet record (DR) and urine collection. The correlations between iodine intake and iodine excretion were also evaluated, and correlation coefficients were calculated for iodine intake in the DR of the overlapping day or the DR 1 day before and after urine collection. RESULTS Median iodine excretion in 24-hour urine was 365 µg, and excretion was significantly higher in older subjects. Iodine intake estimated by the DRs was significantly correlated with urinary iodine excretion when DRs and urine collection were obtained on the same day (r = 0.37). After adjustment for confounding factors, iodine excretion was significantly associated with intakes of kelp and soup stock from kelp and fish. CONCLUSIONS Although multiple measurements for urinary iodine are required to confirm our results, this study showed the current iodine status of healthy Japanese adults. The results suggest that kelp and fish are the main contributors to Japanese iodine status measured by 24-hour urine.
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Affiliation(s)
- Ryoko Katagiri
- Department of Social and Preventive Epidemiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Keiko Asakura
- Department of Social and Preventive Epidemiology, School of Public Health, University of Tokyo, Tokyo, Japan
- Interfaculty Initiative in Information Studies, University of Tokyo, Tokyo, Japan
| | - Ken Uechi
- Department of Social and Preventive Epidemiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | | | - Satoshi Sasaki
- Department of Social and Preventive Epidemiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
- Department of Social and Preventive Epidemiology, School of Public Health, University of Tokyo, Tokyo, Japan
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Nakatsuka H, Chiba K, Watanabe T, Sawatari H, Seki T. Iodine intake by adult residents of a farming area in Iwate Prefecture, Japan, and the accuracy of estimated iodine intake calculated using the Standard Tables of Food Composition in Japan. Environ Health Prev Med 2016; 21:523-530. [PMID: 27722921 DOI: 10.1007/s12199-016-0569-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 08/31/2016] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVES Iodine intake by adults in farming districts in Northeastern Japan was evaluated by two methods: (1) government-approved food composition tables based calculation and (2) instrumental measurement. The correlation between these two values and a regression model for the calibration of calculated values was presented. METHODS Iodine intake was calculated, using the values in the Japan Standard Tables of Food Composition (FCT), through the analysis of duplicate samples of complete 24-h food consumption for 90 adult subjects. In cases where the value for iodine content was not available in the FCT, it was assumed to be zero for that food item (calculated values). Iodine content was also measured by ICP-MS (measured values). RESULTS Calculated and measured values rendered geometric means (GM) of 336 and 279 μg/day, respectively. There was no statistically significant (p > 0.05) difference between calculated and measured values. The correlation coefficient was 0.646 (p < 0.05). DISCUSSION With this high correlation coefficient, a simple regression line can be applied to estimate measured value from calculated value. A survey of the literature suggests that the values in this study were similar to values that have been reported to date for Japan, and higher than those for other countries in Asia. CONCLUSIONS Iodine intake of Japanese adults was 336 μg/day (GM, calculated) and 279 μg/day (GM, measured). Both values correlated so well, with a correlation coefficient of 0.646, that a regression model (Y = 130.8 + 1.9479X, where X and Y are measured and calculated values, respectively) could be used to calibrate calculated values.
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Affiliation(s)
- Haruo Nakatsuka
- Miyagi University Faculty of Nursing, 1-1 Gakuen, Taiwacho, Miyagi, 981-3298, Japan.
| | - Keiko Chiba
- Iwate Prefectural University Morioka Junior College, Takizawa, Iwate, 020-0693, Japan
| | | | | | - Takako Seki
- NEC Network Products, Ltd., Fukushima, 960-8511, Japan
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Ju DL, Park YJ, Paik HY, Kim MJ, Park S, Jung KY, Kim TH, Choi HS, Song YJ. Dietary evaluation of a low-iodine diet in Korean thyroid cancer patients preparing for radioactive iodine therapy in an iodine-rich region. Nutr Res Pract 2015; 10:167-74. [PMID: 27087900 PMCID: PMC4819127 DOI: 10.4162/nrp.2016.10.2.167] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 09/30/2015] [Accepted: 10/28/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND/OBJECTIVES Despite the importance of a low-iodine diet (LID) for thyroid cancer patients preparing for radioactive iodine (RAI) therapy, few studies have evaluated dietary intake during LID. This study evaluated the amount of dietary iodine intake and its major food sources during a typical diet and during LID periods for thyroid cancer patients preparing for RAI therapy, and examined how the type of nutrition education of LID affects iodine intake. SUBJECTS/METHODS A total of 92 differentiated thyroid cancer patients with total thyroidectomy were enrolled from Seoul National University Hospital. All subjects completed three days of dietary records during usual and low-iodine diets before 131I administration. RESULTS The median iodine intake was 290 µg/day on the usual diet and 63.2 µg/day on the LID. The major food groups during the usual diet were seaweed, salted vegetables, fish, milk, and dairy products and the consumption of these foods decreased significantly during LID. The mean energy intake on the LID was 1,325 kcal, which was 446 kcal lower than on the usual diet (1,771 kcal). By avoiding iodine, the intake of most other nutrients, including sodium, was significantly reduced during LID (P < 0.005). Regarding nutritional education, intensive education was more effective than a simple education at reducing iodine intake. CONCLUSION Iodine intake for thyroid cancer patients was significantly reduced during LID and was within the recommended amount. However, the intake of most other nutrients and calories was also reduced. Future studies are needed to develop a practical dietary protocol for a LID in Korean patients.
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Affiliation(s)
- Dal Lae Ju
- Department of Food Service and Nutrition Care, Seoul National University Hospital, Seoul, 03080, Korea
| | - Young Joo Park
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Hee-Young Paik
- Department of Food and Nutrition, Seoul National University, Seoul, 08826, Korea
| | - Min-Ji Kim
- Major of Food and Nutrition, School of Human Ecology, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi 14662, Korea
| | - Seonyeong Park
- Department of Internal Medicine, Seoul National University Hospital Biomedical Research Institute, Seoul, 03080, Korea
| | - Kyong Yeun Jung
- Department of Internal Medicine, Eulji University Hospital, Seoul, 01830, Korea
| | - Tae Hyuk Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 03080, Korea.; Department of Internal Medicine, Thyroid Center, Samsung Medical Center, Seoul, 06351, Korea
| | - Hun Sung Choi
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 03080, Korea.; Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, 24289, Korea
| | - Yoon Ju Song
- Major of Food and Nutrition, School of Human Ecology, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi 14662, Korea
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Ju DL, Park YJ, Paik HY, Song Y. The Impact of Low Adherence to the Low-iodine Diet on the Efficacy of the Radioactive Iodine Ablation Therapy. Clin Nutr Res 2015; 4:267-71. [PMID: 26566522 PMCID: PMC4641989 DOI: 10.7762/cnr.2015.4.4.267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 09/06/2015] [Accepted: 09/25/2015] [Indexed: 11/23/2022] Open
Abstract
To improve the efficacy of radioactive iodine (RAI) therapy for differentiated thyroid cancer patients, a low-iodine diet (LID) prior to the therapy is recommended. In iodine-rich areas such as Korea, however, a strict LID is very difficult to maintain. We experienced the cases of three patients showing low adherence to the LID before initial RAI therapy, and analyzed the main food source supplying iodine during the LID, and examined the influence of the poorly maintained LID on the efficacy of RAI therapy. The dietary intake during the LID periods were assessed using three-day dietary records and remnant thyroid activity after the second RAI administration was also evaluated. All patients' mean daily iodine intake during two-week LID periods exceeded the 100 µg guideline set by the Korean Thyroid Association (median 110.9 µg, ranges 100.4-117.0 µg). Although the typical food sources of iodine intake are seaweeds in Korea, salted vegetables were the main contributor to the patients' iodine intake during the LID periods. Remnant thyroid activity was shown on a follow-up scan in all of 3 patients suggesting low efficacy of RAI therapy. In summary, the patients with low adherence to the LID guideline showed unsuccessful remnant ablation, and the main food source of iodine was salted vegetables. Further studies are necessary to examine the relationship between adherence of the LID and RAI efficacy according to dietary iodine intake levels, as well as food sources that cause low adherence to the LID. These data can then be used to develop more practical LID guidelines.
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Affiliation(s)
- Dal Lae Ju
- Department of Food Service and Nutrition Care, Seoul National University Hospital, Seoul 03080, Korea
- Department of Food and Nutrition, Seoul National University, Seoul 08826, Korea
| | - Young Joo Park
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul 03080, Korea
| | - Hee-Young Paik
- Department of Food and Nutrition, Seoul National University, Seoul 08826, Korea
| | - YoonJu Song
- Major of Food and Nutrition, School of Human Ecology, The Catholic University of Korea, Bucheon 14662, Korea
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11
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Katagiri R, Asakura K, Sasaki S, Hirota N, Notsu A, Miura A, Todoriki H, Fukui M, Date C. Estimation of habitual iodine intake in Japanese adults using 16 d diet records over four seasons with a newly developed food composition database for iodine. Br J Nutr 2015; 114:624-34. [PMID: 26197981 DOI: 10.1017/s0007114515002019] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Although habitual seaweed consumption in Japan would suggest that iodine intake in Japanese is exceptionally high, intake data from diet records are limited. In the present study, we developed a composition database of iodine and estimated the habitual intake of iodine among Japanese adults. Missing values for iodine content in the existing composition table were imputed based on established criteria. 16 d diet records (4 d over four seasons) from adults (120 women aged 30-69 years and 120 men aged 30-76 years) living in Japan were collected, and iodine intake was estimated. Habitual intake was estimated with the Best-power method. Totally, 995 food items were imputed. The distribution of iodine intake in 24 h was highly skewed, and approximately 55 % of 24 h values were < 300 μg/d. The median iodine intake in 24 h was 229 μg/d for women and 273 μg/d for men. All subjects consumed iodine-rich foods (kelp or soup stock) on one or more days of the sixteen survey days. The mean (median) habitual iodine intake was 1414 (857) μg/d for women and 1572 (1031) μg/d for men. Older participants had higher intake than younger participants. The major contributors to iodine intake were kelp (60 %) and soup stock (30 %). Habitual iodine intake among Japanese was sufficient or higher than the tolerable upper intake level, particularly in older generations. The association between high iodine intake as that observed in the present study and thyroid disease requires further study.
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Affiliation(s)
- Ryoko Katagiri
- Department of Social and Preventive Epidemiology,Graduate School of Medicine, The University of Tokyo,7-3-1 Hongo,Bunkyo-ku, Tokyo113-0033,Japan
| | - Keiko Asakura
- Department of Social and Preventive Epidemiology,School of Public Health, The University of Tokyo,Tokyo,Japan
| | - Satoshi Sasaki
- Department of Social and Preventive Epidemiology,Graduate School of Medicine, The University of Tokyo,7-3-1 Hongo,Bunkyo-ku, Tokyo113-0033,Japan
| | - Naoko Hirota
- Graduate School of Health Science, Matsumoto University,Nagano,Japan
| | - Akiko Notsu
- Department of Food Science and Nutrition,Tottori College,Tottori,Japan
| | - Ayako Miura
- Department of Health and Nutritional Sciences,Faculty of Health Promotional Sciences, Tokoha University,Shizuoka,Japan
| | - Hidemi Todoriki
- Department of Public Health and Hygiene,School of Medicine, University of the Ryukyus,Okinawa,Japan
| | - Mitsuru Fukui
- Laboratory of Statistics, Osaka City University Medical School,Osaka,Japan
| | - Chigusa Date
- Department of Food Science and Nutrition,School of Human Science and Environment, University of Hyogo,Hyogo,Japan
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High iodine intake by preschool children in Miyagi prefecture, Japan. Environ Health Prev Med 2014; 19:330-8. [PMID: 24972786 DOI: 10.1007/s12199-014-0394-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 06/04/2014] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVES Standard Tables of Food Composition in Japan 2010 (FCT) remain incomplete for iodine contents. This survey was initiated to develop a method to cope with this shortage and to find daily iodine intake of preschool children in Japan. METHODS Data were available for one-day food intake for 296 3- to 6-year-old children (the total cases). 128 samples (the selected cases) were analyzed by ICP-MS for iodine (the measured values). Iodine intake was also calculated using FCT assuming that iodine contents in missing items were zero (the calculated values). RESULTS Measured and calculated values for the selected 125 cases (after exclusion of 3 extreme cases) gave geometric means (GM) of 117.6 and 101.8 μg/day. The measured/calculated ratio in GM, 117.6/101.8 = 1.155, was applied to the calculated values for total 296 cases to estimate iodine intake (the estimated values). GM for the estimated value was 175.2 μg/day and it was 8.93 μg/kg/day after adjustment for body weight for 296 children. There was no significant difference between boys and girls. DISCUSSION The GM values for both the measured and estimated values (n = 125 pairs) were 117.6 μg/day. The agreement suggested that the factor employed, 1.155, was proper and adequate. Literature survey suggested that values on a body weight basis were comparable between the children and adults in Japan. The levels were higher than levels in east Asian countries. CONCLUSIONS A correction method was developed for estimation of daily dietary iodine intake. The iodine intake level for preschoolers was comparable to levels for adult population.
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