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Excessive iodine intake in schoolchildren

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Abstract

Purpose

Inadequate iodine intake may result in iodine deficiency disorders (IDD). Thus, for more than 50 years, policies for the regulation of salt fortification with iodine have existed in Brazil. In 2003, a study on 6–14-year-old schoolchildren from regions of the state of São Paulo showed a median urinary iodine concentration of 360 μg/L. The objective of the present study was to assess the iodine nutrition status among schoolchildren.

Methods

The study was conducted on 828 schoolchildren aged 4–13 years from eight schools in the interior of the state of São Paulo. A casual urine sample was collected from each volunteer for iodine determination by the adapted method of Sandell-Kalthoff.

Results

Only 1.9% (n = 16) of the children evaluated had low values of urinary iodine (<100 μg/L), while 24.6% had urinary iodine excretion values between 200 and 300 μg/L, and 67.1% had values above >300 μg/L.

Conclusions

The results show that the iodine nutritional status of the schoolchildren studied is characterized by a high urinary iodine excretion, which might reveal an increase in iodine consumption by this population.

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Authors and Affiliations

  1. Department of Internal Medicine, Medical School of Ribeirão Preto, University of São Paulo, Bandeirantes Avenue 3900 6th, Ribeirão Preto, São Paulo, 14048-900, Brazil

    Adriana Lelis Carvalho, Clarissa Janson Costa de Souza Meirelles & Anderson Marliere Navarro

  2. Food and Nutrition Department, School of Pharmaceutical Science, State University of São Paulo, Araraquara-Jaú Road, km 1 502, Araraquara, São Paulo, 14801-902, Brazil

    Luciana Abrão Oliveira

  3. Nutrition Course, University of Ribeirão Preto, Costábile Romano Avenue, 2201, Ribeirão Preto, São Paulo, 14096-900, Brazil

    Telma Maria Braga Costa

Authors
  1. Adriana Lelis Carvalho
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  2. Clarissa Janson Costa de Souza Meirelles
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  3. Luciana Abrão Oliveira
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  4. Telma Maria Braga Costa
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  5. Anderson Marliere Navarro
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Correspondence to Adriana Lelis Carvalho.

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Carvalho, A.L., de Souza Meirelles, C.J.C., Oliveira, L.A. et al. Excessive iodine intake in schoolchildren. Eur J Nutr 51, 557–562 (2012). https://doi.org/10.1007/s00394-011-0239-7

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  • DOI: https://doi.org/10.1007/s00394-011-0239-7

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