Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Dietary iodine intake and the association with subclinical thyroid dysfunction in male workers

직장인 남성에서 식이 요오드섭취량과 불현성 갑상선기능이상과의 연관성

  • Kim, Eun-Hye (Deparment of Medical Nutrition, Kyunghee University) ;
  • Choi, Tae-in (Radiation Health Research Institute, Korea & Hydro Nuclear Power Co., Ltd.) ;
  • Park, Yoo-Kyoung (Deparment of Medical Nutrition, Kyunghee University)
  • 김은혜 (경희대학교 동서의학대학원 의학영양학과) ;
  • 최태인 (한국수력원자력 방사선 보건 연구원) ;
  • 박유경 (경희대학교 동서의학대학원 의학영양학과)
  • Received : 2011.12.19
  • Accepted : 2012.03.01
  • Published : 2012.06.30
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Abstract

The prevalence rate of thyroid dysfunction (hypothyroidism and hyperthyroidism) has increased within the Korean population and seems to be affected by iodine dietary habits. Some studies reported that the prevalence of thyroid dysfunction increase both in the area of iodine deficiency and excess. In this study, we tried to discover the difference in iodine intake, anthropometric measurements, and blood parameters between male subjects with or without subclinical thyroid dysfunction. A total of 5,249 subjects (Euthyroid: 4706, SubHypo: 454, SubHyper: 89) were used in this study. There were no significant differences in BMI, body fat, visceral fat, waist circumference, SBP, DBP, total cholesterol, HDL-cholesterol, LDL-cholesterol, TG, fasting serum glucose, HbA1c, alcohol intake, however significant differences were noticed in both age and smoking status. Through a food frequency questionnaire (FFQ), iodine intake per day was estimated. The average iodine intake was similar (SubHypo $392.9{\pm}279.0{\mu}g$, Euthyroid $376.5{\pm}281.7{\mu}g$, SubHyper $357.3{\pm}253.8 {\mu}g$) among groups. The main source of iodine intake was eggs (52.8%, 54.2%, 52.4%) followed by milk (16.3%, 15.8%, 17.8%), then sea mustard & sea tangle (12.4%, 11.9%, 11.6%). The prevalence of subclinical hypothyroidism and subclinical hyperthyroidism was higher in subjects whose intake was higher than the recommended nutrient intake (RNI). These results suggest that the excess consumption of iodine intake may act as one of the risk factors regarding thyroid dysfunction in Korea. Therefore, an adequate amount of iodine intake is necessary in order to prevent subclinical thyroid dysfunction and clinical thyroid dysfunction.

Keywords

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