Nightingale Nutrition Practice Exam

Which mineral is most directly linked to thyroid function?

Iron Iodine Potassium Sodium

Correct Answer:

Iodine

Explanation:

Iodine is essential for making thyroid hormones. The thyroid gland cannot produce T3 and T4 without iodide; it actively takes up iodide, incorporates it into the hormone structure, and then releases the hormones into circulation. When iodine is insufficient, thyroid hormone production drops, leading to hypothyroidism and often a goiter as the gland tries to compensate. Adequate iodine allows normal hormone synthesis, while potassium, sodium, and iron aren’t directly used to build thyroid hormones, so they’re not the mineral most closely tied to thyroid function.

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