Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Brazil nuts are notably rich in selenium, an essential micronutrient critical for thyroid health. Selenium is a cofactor for several enzymes involved in thyroid hormone synthesis and metabolism, particularly the iodothyronine deiodinases that convert thyroxine (T4) to the more biologically active triiodothyronine (T3). Scientific studies have shown that adequate selenium intake supports optimal thyroid function and may help protect the thyroid gland against oxidative damage. Clinical trials have also demonstrated that selenium supplementation can reduce thyroid peroxidase antibody levels in individuals with autoimmune thyroiditis (such as Hashimoto’s disease), potentially contributing to improved thyroid status.

Brazil nuts are among the richest dietary sources of selenium, with one nut often providing more than the recommended daily allowance. Several peer-reviewed studies, including randomized controlled trials, have validated that consumption of Brazil nuts effectively raises selenium levels and may benefit thyroid function, especially in individuals with marginal selenium status. However, excessive intake should be avoided due to the risk of selenium toxicity. Overall, the scientific evidence supports the use of Brazil nuts, in moderation, as a dietary means of supporting thyroid health, primarily due to their selenium content.

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