Exploration of the safe upper level of iodine intake in euthyroid Chinese adults: a randomized double-blind trial  

Oleh:

Sang, Zhongna ; Wang, Peizhong Peter ; Yao, Zhaixiao ; Jun Shen

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: The American Journal of Clinical Nutrition vol. 95 no. 02 (Feb. 2012), page 367-373 .
Topik: VITAMINS; Minerals; Phytochemicals; Chinese Population
Fulltext: A07 v95 n2 p367 kelik2022.pdf (116.58KB)

Ketersediaan

Perpustakaan FK Nomor Panggil: A07.K.2012.01 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Background: The beneficial health effects associated with Universal Salt Iodization are well known. Yet, little is known about the possible adverse health effects in people with high iodine intake and the safe daily intake upper limit in the Chinese population. Objective: The objective of this study was to explore the safe upper level of total daily iodine intake among adults in China. Design: A 4-wk, double-blind, placebo-controlled, randomized controlled trial was conducted in 256 euthyroid adults. Participants were randomly assigned to 12 intervention groups with various iodine supplement doses ranging from 0 to 2000 µg/d. Total iodine intake included iodine from both supplements and diet. Multiple outcome measures were used to evaluate possible adverse effects, including thyroid function, thyroid size, and urinary iodine. Results: The mean iodine intake from the diets and salt intake of the participants were 105 ± 25 and 258 ± 101 µg/d, respectively. In comparison with the placebo group, all iodide-supplemented groups responded with significant increases in median urinary iodine concentrations (P < 0.05) and in thyroid-stimulating hormone concentration (P < 0.05). Thyroid volume decreased after 4 wk in the high-iodine intervention groups (1500–2000 µg). Subclinical hypothyroidism appeared in the groups that received 400 µg I (5%) and 500–2000 µg I (15–47%). Conclusions: This study showed that subclinical hypothyroidism appeared in the participants who took the 400-µg I supplement, which provided a total iodine intake of ~800 µg/d. Thus, we caution against a total daily iodine intake that exceeds 800 µg/d in China and recommend further research to determine a safe daily upper limit.

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