Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Protein plays a scientifically recognized role in supporting the thyroid gland and its function. The thyroid gland produces hormones (primarily thyroxine/T4 and triiodothyronine/T3) that regulate metabolism, growth, and overall energy balance. The production of these hormones relies on amino acids, the building blocks of proteins. Specifically, the amino acid tyrosine is a key component of thyroid hormone synthesis. Dietary protein provides tyrosine, which, in combination with iodine, is necessary for the creation of T3 and T4. Several studies have demonstrated that inadequate protein intake can negatively impact thyroid function. For example, protein malnutrition may reduce levels of thyroid hormones, decrease the conversion of T4 to the more active T3, and impair overall thyroid function. Conversely, adequate protein intake supports optimal thyroid hormone production and metabolic health. While there is limited evidence that increasing protein beyond normal dietary requirements directly enhances thyroid health, ensuring sufficient protein in the diet is important for those at risk of deficiency. It is important to note that while protein is essential for thyroid hormone synthesis, supplementation with protein or high-protein diets is not a treatment for thyroid disorders. Instead, protein's role is foundational, ensuring that the thyroid has the necessary raw materials for hormone production as part of a balanced diet.

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