An investigation on the dietary iodine intake levels of residents in Hainan Province and the dietary iodine contribution rates
10.3760/cma.j.cn231583-20240801-00212
- VernacularTitle:海南省居民膳食碘摄入水平及膳食碘贡献率调查
- Author:
Hongying WU
1
;
Shizhu MENG
1
;
Xiaohuan WANG
1
;
Dingwei SUN
1
;
Bin HE
1
;
Ying LIU
1
;
Xingren WANG
1
Author Information
1. 海南省疾病预防控制中心（海南省预防医学科学院）地方病与慢性病预防控制科，海口 570203
- Publication Type:Journal Article
- Keywords:
Iodine;
Salts;
Diet surveys
- From:
Chinese Journal of Endemiology
2025;44(4):307-312
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the dietary iodine intake levels of residents and the dietary iodine contribution rates in Hainan Province.Methods:Using cluster random sampling method, common foods sold in 21 counties (cities, districts) markets in Hainan Province in 2023 were collected to determine iodine content. Each county (city, district) was divided into five sampling areas by east, west, south, north, and center, with one township (street) selected from each area, and 20 permanent residents over 18 years old (non same household, half male and half female) and 20 pregnant women were selected from each township (street). The "Iodine-Specific Food Frequency Questionnaire (I-FFQ)" was used to investigate the daily dietary intake of adults and pregnant woman. The average daily salt intake of the survey subjects was measured by the 3-day weighing method, and the dietary iodine intake and the dietary iodine contribution rates were calculated.Results:A total of 632 food samples were collected, and the iodine content of seaweed was relatively high (4 424.76 μg/100 g); the iodine content of seasoning was relatively low (2.41 μg/100 g). A total of 4 227 individuals in Hainan Province were surveyed for dietary iodine intake. The median dietary iodine intake level of residents was 211.6 μg/d, with the medians dietary iodine intake level of adults and pregnant women being 204.5 and 218.4 μg/d ( n = 2 120, 2 107), respectively. There was a statistically significant differences between different populations ( Z = - 8.64, P < 0.001). The medians dietary iodine intake level in the western coastal areas, central mountainous regions, and eastern coastal areas were 210.0, 207.3 and 211.6 μg/d ( n = 1 205, 1 203, 1 819), respectively, with statistically significant differences between different regions ( H = 15.33, P < 0.001). The contribution rate of dietary iodine from iodized salt was the most (59.4%), followed by kelp (8.1%). Conclusions:Under the condition of consuming iodized salt, the dietary iodine intake of adults in Hainan Province meets the recommended dietary iodine intake ( > 120 μg/d), but the dietary iodine intake of pregnant women is insufficient ( < 230 μg/d). Iodized salt is the main source of dietary iodine for residents in Hainan Province.
