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Fu M, Guo W, Ren Z, Zhang H, Wu W, Sun Y, Pan Z, Ji F, Zhang W. Iodine-specific food frequency questionnaire can evaluate iodine intakes of Chinese pregnant women. Nutr Res 2023; 118:146-153. [PMID: 37703645 DOI: 10.1016/j.nutres.2023.08.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 08/13/2023] [Accepted: 08/13/2023] [Indexed: 09/15/2023]
Abstract
Iodine is an essential trace element for the synthesis of thyroid hormones, which play an important role in growth and development, metabolism, and body organ function. There is no iodine-specific food frequency questionnaire (I-FFQ) for pregnant women in China. This study aimed to validate and optimize an I-FFQ. A total of 1802 pregnant women were included in this study. The iodine nutrition survey was performed using I-FFQ and 3-day estimated food diary (3DEFD). Seventy-one women of reproductive age repeated the I-FFQ twice to assess for FFQ reproducibility. Further optimization of the I-FFQ was accomplished by integrating iodine contributions to simplified questionnaire items. Correlation and Bland-Altman analyses were used to verify the consistency of I-FFQ with 3DEFD, as well as the stability and feasibility of I-FFQ optimization. The I-FFQ and 3DEFD had a strong correlation (R = 0.76, P < .001) and agreement (Kappa = 0.731, P < .001). A Bland-Altman plot showed that 5.1% of participants exceeded the limit of agreement. Nonpregnant women of reproductive age completed the I-FFQ twice, and the results had a strong correlation (R = 0.72, P < .001). A Bland-Altman analysis showed that 5.6% of individuals were located outside the limit of agreement. The consistency of I-FFQ before and after optimization was good (Kappa = 0.982, P < .001). Therefore, I-FFQ could be used as a valid tool to estimate iodine intake among Chinese pregnant women. The optimized I-FFQ could shorten survey time without affecting its accuracy.
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Affiliation(s)
- Min Fu
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Wenxing Guo
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Zhiyuan Ren
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Haixia Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Wen Wu
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Yu Sun
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Ziyun Pan
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China
| | - Fengying Ji
- Qingdao Municipal Center for Disease Control and Prevention, Qingdao, China; Qingdao Institute of Preventive Medicine, Qingdao, China.
| | - Wanqi Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, China; Tianjin Key Laboratory of Hormones and Development (Ministry of Health), Tianjin, China.
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Fuse Y, Urakawa Y, Tsukada N, Ito Y, Yoshida M, Shishiba Y. Variability and Seasonal Change of Urinary Selenium, Molybdenum, and Iodine Excretion in Healthy Young Japanese Adults. Biol Trace Elem Res 2022:10.1007/s12011-022-03487-x. [PMID: 36394795 DOI: 10.1007/s12011-022-03487-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 11/09/2022] [Indexed: 11/18/2022]
Abstract
Selenium (Se), molybdenum (Mo), and iodine (I) are essential trace elements or nutrients and their adequate intake is essential for human health. These elements in foods are easily absorbed from the digestive tract and excreted predominantly into the urine, and their nutritional status is reflected in urinary excretion; however, information on the variability of urinary excretion is limited. To characterize the urinary Se, Mo, and I concentrations and their intra- and inter-individual coefficients of variation (CV), correlation, and seasonal change, spot urine samples were collected from 24 healthy university students, 10 males and 14 females, with the mean age of 20.6 years, for 10 consecutive days in each of the four seasons according to a defined schedule of an interval of 3 months throughout 1 year. The median Se, Mo, and I concentrations for all urine samples (n = 947) were 52.8, 127.0, and 223 μg/L, respectively. The Se and Mo intakes were highest in summer and lowest in spring, while the I intake was highest in autumn and lowest in summer. In all three elements, the intra-individual CVs were smaller than their inter-individual CVs. The log-transformed intra- and inter-individual CVs were 10.5 and 14.7% for Se, 12.3 and 15.1% for Mo, and 15.5 and 18.1% for I. There was no gender difference in Se and I concentrations, while Mo and Mo/Cr values in males were higher than those in females. Our results suggest adequate nutritional status of Se, Mo, and I with a relatively smaller variability of dietary intake except for I in this population.
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Affiliation(s)
- Yozen Fuse
- Research Committee On Iodine Related Health Problems, Foundation for Growth Science, 5-1-16 Hongo, Bunkyou-Ku, Tokyo, 1130033, Japan.
| | - Yumiko Urakawa
- Kamakura Women's University, 6-1-3 Ofuna, Kamakura, Kanagawa, 2470056, Japan
| | - Nobu Tsukada
- Kagawa Nutrition University, Institute of Nutrition Sciences, 3-9-21 Chiyoda, Sakado, Saitama, 3500288, Japan
| | - Yoshiya Ito
- Division of Clinical Medicine, The Japanese Red Cross Hokkaido College of Nursing, 664-1, Akebonochou, Kitami, Hokkaido, 0900011, Japan
| | - Munehiro Yoshida
- Laboratory of Food and Nutritional Sciences, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 Yamatechou, Suita, Osaka, 564-8680, Japan
| | - Yoshimasa Shishiba
- Research Committee On Iodine Related Health Problems, Foundation for Growth Science, 5-1-16 Hongo, Bunkyou-Ku, Tokyo, 1130033, Japan
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Fuse Y, Ito Y, Shishiba Y, Irie M. Current Iodine Status in Japan: A Cross-sectional Nationwide Survey of Schoolchildren, 2014-2019. J Clin Endocrinol Metab 2022; 107:e2065-e2079. [PMID: 34935958 DOI: 10.1210/clinem/dgab919] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Indexed: 11/19/2022]
Abstract
CONTEXT Japan has been regarded as a long-standing iodine-sufficient country without iodine fortification; however, data on nationwide iodine status are lacking. OBJECTIVE This study aimed to characterize the iodine status in Japan. METHODS From 2014 through 2019, a nationwide school-based survey was conducted across all districts in Japan. Urinary iodine concentration (UIC), creatinine (Cr) concentration, and anthropometry were assessed in healthy school-aged children (SAC) aged 6 to 12 years. Their iodine status is regarded as generally representative of the nation's iodine status. RESULTS A total of 32 025 children participated. The overall median UIC was 269 μg/L, which was within the World Health Organization's adequacy range. There was a regional difference in UIC values within 14 regions, and the lowest and highest median UICs were found in Tanegashima Island (209 μg/L) and Nakashibetsu, Hokkaido (1071 μg/L), respectively. The median UIC ≥ 300 μg/L was observed in 12 of 46 regions. By using estimated 24-hour urinary iodine excretion (UIE), the prevalence of SAC exceeding the upper tolerable limit of iodine for Japanese children was from 5.2% to 13.7%. The UIC values did not change with age, body surface area and body mass index percentile, whereas the Cr concentration simultaneously increased suggesting the effect of urinary creatinine on UI/Cr and estimated 24-hour UIE values. CONCLUSIONS The iodine intake of Japanese people is adequate, but in some areas it is excessive. The incidence and prevalence of thyroid disorders associated with iodine intake should be obtained, especially in the areas where high amounts of iodine are consumed.
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Affiliation(s)
- Yozen Fuse
- Research Committee on Iodine Related Health Problems, Foundation for Growth Science, Tokyo 113-0033, Japan
| | - Yoshiya Ito
- Research Committee on Iodine Related Health Problems, Foundation for Growth Science, Tokyo 113-0033, Japan
- Division of Clinical Medicine, Japanese Red Cross Hokkaido College of Nursing, Kitami, Hokkaido 090-0011, 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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