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Estimation of appropriate dietary intake of iodine among lactating women in China based on iodine loss in breast milk.
Zhang, Ying; Gu, Wenwen; Zhao, Xin; Shan, Le; Zhang, Zixuan; Wu, Xinhong; Zhang, Xinbao; Cao, Yanning; Sang, Zhongna.
Affiliation
  • Zhang Y; Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, No.22 Qixiangtai Road Heping District, Tianjin, 300070, China.
  • Gu W; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Center for International Collaborative Research on Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, 300070, China.
  • Zhao X; Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, No.22 Qixiangtai Road Heping District, Tianjin, 300070, China.
  • Shan L; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Center for International Collaborative Research on Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, 300070, China.
  • Zhang Z; Department of Microsurgery, Tianjin Hospital, Tianjin, 300299, China.
  • Wu X; Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, No.22 Qixiangtai Road Heping District, Tianjin, 300070, China.
  • Zhang X; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Center for International Collaborative Research on Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, 300070, China.
  • Cao Y; Department of Preventive Medicine, School of Public Health, Jilin University, Changchun, 130015, China.
  • Sang Z; Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, No.22 Qixiangtai Road Heping District, Tianjin, 300070, China.
Eur J Nutr ; 62(2): 739-748, 2023 Mar.
Article in En | MEDLINE | ID: mdl-36209299
ABSTRACT

OBJECTIVE:

Data on iodine loss in breast milk, which are critical for establishing the appropriate dietary iodine intake for lactating women, is currently limited. A study was conducted to assess iodine loss in breast milk among Chinese lactating women to estimate the appropriate dietary intake of iodine.

METHODS:

A total of 54 pairs of healthy, lactating women and their infants aged 0-6 months were recruited from Tianjin and Luoyang cities in China. A 4 days infant weighing study was conducted to assess iodine loss in the breast milk of lactating women. Mothers were required to weigh and record their infants' body weights before and after each feeding for a 24 h period from 800 am to 800 am. During the weighing study, 2812 breast milk samples and 216 24-h urine samples were collected from each lactating mother for four consecutive days. In addition, a 3 days 24 h dietary record, including salt weighing and drinking water samples collecting, was performed by each lactating mother to determine dietary iodine intake during the weighing study.

RESULTS:

The average dietary iodine intake of lactating women was 323 ± 80 µg/d. The median breast milk iodine concentration and 24 h urinary iodine concentration of lactating women were 154 (122-181) and 135 (104-172) µg/L, respectively. The mean volume of breast milk and the mean iodine loss in the breast milk of lactating women were 711 ± 157 mL/d and 112 ± 47 µg/d, respectively. The appropriate dietary intake of iodine among lactating Chinese women is approximately 260 µg/d.

CONCLUSIONS:

Based on the iodine loss in breast milk (110 µg/d) found in this study, and the estimated average requirement of iodine for adults, the appropriate dietary intake of iodine among lactating Chinese women is 260 µg/d, which is higher than the 240 µg/d recommended by the China Nutrition Science Congress in 2013.
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Full text: 1 Database: MEDLINE Main subject: Iodine / Milk, Human Limits: Adult / Female / Humans / Infant Country/Region as subject: Asia Language: En Year: 2023 Type: Article

Full text: 1 Database: MEDLINE Main subject: Iodine / Milk, Human Limits: Adult / Female / Humans / Infant Country/Region as subject: Asia Language: En Year: 2023 Type: Article