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Iodine status of adolescent girls in a population changing from high to lower fish consumption

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Authors
Gunnarsdottir, I
Gunnarsdottir, B E
Steingrimsdottir, L
Maage, A
Johannesson, A J
Thorsdottir, I
Issue Date
2010-09-01

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Citation
Eur J Clin Nutr. 2010, 64(9):958-64
Abstract
Objectives:During the last decades, fish and milk consumption has decreased considerably in Iceland, especially among adolescents. As these food items are important dietary iodine (I) sources, the aim of the study was to assess the iodine status and dietary pattern of adolescent girls in a population changing from a high to lower consumption of milk and fish.Subjects/Methods:Subjects were randomly selected adolescent girls (16-20 years old, n=112). A validated Food Frequency Questionnaire (FFQ) was used to evaluate food consumption and compare it with food-based dietary guidelines for milk and dairy products (2-3 portions/day) and fish (>/=2 times/week). Urine samples were collected for measuring urinary iodine (U-I) and creatinine (Cr) and blood samples for measuring serum thyroid-stimulating hormone (TSH).Results:Milk and dairy products provided 43% and fish provided 24% of the total dietary I. More than 65% of the girls consumed fish less than twice a week, and 40% consumed less than two portions of milk and dairy products per day. The median U-I concentration was 200 mug/l and the U-I/Cr ratio 138 mug I/g Cr. High intake of milk was associated with higher urinary iodine concentration, but fish intake was not found to be directly associated with urinary iodine concentration.Conclusions:Iodine status of Icelandic adolescent girls is within the optimal range defined by the World Health Organization. It is important to monitor both iodine status and the iodine concentration of important sources of iodine, as both dietary habits and composition of food might change with time.
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http://dx.doi.org/10.1038/ejcn.2010.100
ae974a485f413a2113503eed53cd6c53
10.1038/ejcn.2010.100
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