Effect of Iodine Deficiency On Thyroid Hormone Synthesis
If there is a deficiency of dietary iodine, the thyroid will not be able to make thyroid hormone. The lack of thyroid hormone will lead to decreased negative feedback on the pituitary, leading to increased production of thyroid-stimulating hormone, which causes the thyroid to enlarge (goiter)endemic colloid goiter. This has the effect of increasing the thyroid's ability to trap more iodide, compensating for the iodine deficiency and allowing it to produce adequate amounts of thyroid hormone.
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—Administration in the State of Sout, U.S. public relief program (1935-1943)
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