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The role of iodine in brain development
1International Council for Control of Iodine Deficiency Disorders, 153 Avenue de la Fauconnerie, B-1170 Brussels, Belgium. fdelange@ulb.ac.be
The Proceedings of the Nutrition Society
|May 29, 2000
Summary
Iodine deficiency severely impacts thyroid function and irreversible brain development in infants and children. Addressing iodine deficiency is crucial for preventing global intellectual disability and brain damage.
Area of Science:
- Endocrinology
- Neuroscience
- Public Health
Background:
- Iodine is essential for thyroid hormone synthesis.
- Thyroid hormones are critical for fetal and early postnatal brain development.
- Iodine deficiency poses a significant global health risk.
Purpose of the Study:
- To review the impact of iodine deficiency on maternal and neonatal thyroid function.
- To assess the effects of iodine deficiency on infant and child intellectual development.
- To highlight iodine deficiency as a leading cause of preventable brain damage.
Main Methods:
- Literature review focusing on iodine intake, thyroid function, and neurodevelopmental outcomes.
- Analysis of studies examining various degrees of iodine deficiency (mild, moderate, severe).
- Examination of the role of maternal hypothyroxinaemia and co-existing selenium deficiency.
Main Results:
- All levels of iodine deficiency negatively affect maternal/neonatal thyroid function and child cognitive development.
- The severity of impairment correlates with the extent of iodine deficiency.
- Overt endemic cretinism, characterized by irreversible mental retardation and neurological damage, is the most severe consequence.
Conclusions:
- Iodine deficiency causes a population-level loss of 10-15 IQ points.
- It is the world's foremost cause of preventable brain damage and intellectual disability.
- Ensuring adequate iodine intake is vital for protecting cognitive development globally.