Iodine is a mineral necessary for the production of thyroid hormones, and excess consumption of iodine-rich foods such as seaweed and kelp can cause or worsen hyperthyroidism.[1] One study found that the autoimmune protocol diet reduced inflammation and symptoms associated with Hashimoto’s thyroiditis, an autoimmune disease causing hypothyroidism. Although Graves’ disease, another autoimmune thyroid disorder, is the most common cause of hyperthyroidism in countries with adequate iodine intake, not all hyperthyroidism occurs via autoimmune mechanisms. More research is needed to see if this benefit extends to people experiencing hyperthyroidism.[2]
How could diet affect hyperthyroidism?
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•Last Updated: May 16, 2025
Excessive consumption of iodine-rich foods can cause or worsen hyperthyroidism. Limited research suggests that the autoimmune protocol diet may improve symptoms associated with Hashimoto’s thyroiditis, an autoimmune disease that causes hypothyroidism.