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01-06-2011 | Original Contribution

Seasons but not ethnicity influence urinary iodine concentrations in Belgian adults

Authors: Rodrigo Moreno-Reyes, Yvon A. Carpentier, Pascale Macours, Beatrice Gulbis, Bernard Corvilain, Daniel Glinoer, Serge Goldman

Published in: European Journal of Nutrition | Issue 4/2011

Abstract

Background

Mild iodine deficiency (MID) is endemic in Belgium. Previous surveys, which assessed iodine nutrition in Belgium, focused on children. The iodine status of adults and the influence of ethnicity or seasonality on urinary iodine concentrations (UIC) have not been investigated. Since the nutritional profile of children differs from that of adults, we may anticipate similar differences in iodine status. Seasonal fluctuations in UIC have also been reported from other MID regions.

Aim of the study

We aimed at assessing iodine status and its association with ethnicity and seasonality in adults.

Methods

A stratified random sample of 401 healthy subjects aged between 40 and 60 years, of Belgian, Moroccan, Turkish and Congolese descent residing in Brussels was obtained. Iodine status and thyroid function were determined.

Results

Median UIC was 68 μg/L. The frequency of UIC below 100 μg/L was 73.3%, of which 41.9% fell between 50 and 99 μg/L, and 29.8% between 49 and 20 μg/L. There was no difference in UIC and thyroid function between subjects of different ethnic origins. The frequency of UIC below 50 μg/L was higher in the fall-winter compared to spring-summer periods (P = 0.004). Serum FT3 concentrations, but not FT4 and TSH, were significantly greater in winter than in summer.

Conclusion

Seasonal fluctuations in UIC suggest that the risk of iodine deficiency among adults living in Brussels is higher in fall-winter than in spring-summer. The prevalence of MID in Brussels is high among adults but ethnicity does not appear to influence iodine status.

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Title: Seasons but not ethnicity influence urinary iodine concentrations in Belgian adults
Authors: Rodrigo Moreno-Reyes
Yvon A. Carpentier
Pascale Macours
Beatrice Gulbis
Bernard Corvilain
Daniel Glinoer
Serge Goldman
Publication date: 01-06-2011
Publisher: Springer-Verlag
Published in: European Journal of Nutrition / Issue 4/2011
Print ISSN: 1436-6207
Electronic ISSN: 1436-6215
DOI: https://doi.org/10.1007/s00394-010-0137-4

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