Does caffeine affect thyroid hormone levels? In US survey data, 2–4 cups of coffee a day were linked to lower TSH, with no significant change in T4 or T3

Thyroid hormones set much of the body's metabolic pace, and caffeine is a widely used stimulant in training and daily life. Online claims run in both directions: that coffee suppresses thyroid function, or that it boosts metabolism through the thyroid. What do large population datasets show about caffeine and thyroid markers?

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