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Iodine concentration in cow's milk and its relation with urinary iodine concentrations in the population.
MedLine Citation:
PMID:  20675020     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND & AIMS: The importance of milk intake to the supply of dietary iodine is not fully known. We therefore undertook a study in Spain of the iodine concentration in cow's milk and the impact of the frequency of milk consumption on urinary iodine concentrations in three study populations.
METHODS: We studied the iodine concentration in 362 samples of milk from 45 commercial brands and compared it with the milk iodine status in studies undertaken 17 years earlier. The epidemiologic studies were performed in three different places in the south of Spain: two in school-age children (N = 757 and N = 1205 children) and one in adults (N = 1051). A milk consumption questionnaire was given and urinary iodine concentrations measured.
RESULTS: The mean concentration of iodine in the milk rose from 1991 (117 ± 37 μg/L) to 2008 (259 ± 58 μg/L) (P < 0.001). The iodine concentration was greater in skimmed milk (273 ± 52 μg/L) than in semi-skimmed milk (254 ± 57 μg/L) or whole milk (251 ± 61 μg/L) (P < 0.0001). The winter samples had a greater concentration of iodine (270 ± 55 μg/L) than the summer samples (247 ± 58 μg/L) (P < 0.0001), independently of the type of milk. The urinary iodine concentrations in all three epidemiologic studies were significantly associated with the frequency of milk intake.
CONCLUSIONS: The concentration of iodine in cow's milk has risen over recent years, and it is higher in skimmed milk. The results also show that cow's milk is a relevant source of dietary iodine.
Federico Soriguer; Carolina Gutierrez-Repiso; Stella Gonzalez-Romero; Gabriel Olveira; Maria J Garriga; Ines Velasco; Piedad Santiago; Gabriella M de Escobar; Eduardo Garcia-Fuentes;
Publication Detail:
Type:  Journal Article     Date:  2010-08-01
Journal Detail:
Title:  Clinical nutrition (Edinburgh, Scotland)     Volume:  30     ISSN:  1532-1983     ISO Abbreviation:  Clin Nutr     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-02-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8309603     Medline TA:  Clin Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  44-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd and European Society for Clinical Nutrition and Metabolism. All rights reserved.
Servicio de Endocrinología y Nutrición, Hospital Regional Universitario Carlos Haya, Málaga, Spain; Ciber Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Málaga, Spain.
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