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Iodine deficiency in pregnancy, infancy and childhood and its consequences for brain development

Alida Melse-Boonstra1, Nidhi Jaiswal

  • 1Division of Human Nutrition, Wageningen University, 6700 EV Wageningen, the Netherlands. alida.melse@wur.nl

Best Practice & Research. Clinical Endocrinology & Metabolism
|February 23, 2010
PubMed

Insights

Iodine deficiency harms cognitive development in children. Supplementation may improve cognitive performance, but more research is needed, especially in infants and young children.

Area of Science:

  • Nutrition Science
  • Developmental Pediatrics
  • Public Health

Background:

  • Iodine deficiency during fetal development and early childhood is linked to cognitive impairment.
  • Existing studies on iodine supplementation in school-aged children show potential benefits but have methodological limitations.
  • Cognitive assessment tools for iodine deficiency effects require refinement.

Purpose of the Study:

  • To review the impact of iodine deficiency on cognitive development.
  • To evaluate the efficacy of iodine supplementation for improving cognitive performance.
  • To identify optimal methods for assessing iodine status in children and populations.

Main Methods:

  • Literature review of randomized clinical studies and observational data.
  • Analysis of diagnostic indicators for iodine deficiency, including thyroid-stimulating hormone (TSH) and thyroglobulin (Tg).
  • Assessment of maternal and infant iodine supplementation strategies.

Main Results:

  • Iodine supplementation may enhance cognitive performance in school-aged children, though study methodologies vary.
  • Maternal iodine supplementation shows promise for improving offspring cognition in deficient areas, but long-term data is scarce.
  • Thyroid-stimulating hormone (TSH) in newborns and thyroglobulin (Tg) in older children are key indicators; urinary iodine is useful at the population level.

Conclusions:

  • Adequate salt iodization is crucial for meeting iodine needs in infants, children, and pregnant women.
  • Further randomized controlled trials with long-term outcomes are necessary, particularly for infants and young children.
  • Close monitoring of iodine status and supplementation programs is essential for public health.

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