Iodine during pregnancy

Definition

An essential trace mineral required for thyroid hormone synthesis, critical for fetal brain development. The recommended intake increases to 220 mcg daily during pregnancy to support fetal neurological development.

How it works

Iodine is crucial for producing thyroid hormones that regulate metabolism and are essential for fetal brain development, particularly during the second and third trimesters. Maternal iodine deficiency during pregnancy increases the risk of intellectual disability, hypothyroidism, and growth retardation in the fetus. Pregnancy increases the urinary excretion of iodine by 50%, creating additional demands on maternal stores. In regions with adequate iodine fortification, deficiency is less common, but it remains a concern in some populations. Most prenatal vitamins include iodine, and iodized salt is a convenient dietary source.

Role

Supports thyroid hormone synthesis necessary for fetal brain development and neurological function.

Examples

• Iodized salt
• Seaweed
• Dairy products
• Eggs
• Fish
• Shellfish
• Iodine-containing prenatal vitamins

Recommendations

Ensure intake of 220 mcg iodine daily through iodized salt, dairy products, or prenatal supplements. If using prenatal vitamins, verify they contain iodine to prevent deficiency. Avoid excessive seaweed consumption as it may provide excessive iodine.

Key takeaway

Adequate iodine during pregnancy is essential for preventing fetal neurological impairment and thyroid dysfunction.

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