Prospective study reveals iodine excess and aging jointly increase thyrotropin in adults, indicating health risks.
Elevated TSH levels induced by chronic iodine excess cannot be downregulated by reducing iodine intake. In nonautoimmune contexts, an interaction effect between iodine status and aging synergistically modulates the TSH rising degree. Iodine excess contributes to mild SCH and is correlated with high baseline TSH levels.
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Gao et al. (2026) studied this question.
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