Thyroid hormones are manufactured from iodine and tyrosine. With the advent of iodized salt the incidents of iodine deficiency has been greatly reduced in the United States. It has been estimated that 25 – 40% of the general adult population suffers from moderate to severe hypothyroidism. This may be due to the poor nutrient value in the foods eaten, or eating foods that block the synthesis of thyroid hormone. Tyrosine, which is synthesized in the body from the amino acid phenylalanine, is a precursor of thyroid hormones. Receiving sufficient amounts of tyrosine from the standard American diet is very difficult, thus supplementation is usually indicated.
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