TSH (thyroid-stimulating hormone) is a diagnostic marker for thyroid function, not a direct weight-loss agent. Elevated TSH indicates hypothyroidism, which is associated with weight gain and a slowed metabolism. Treating diagnosed hypothyroidism with thyroid hormone replacement can normalize metabolism and thereby support weight loss. However, TSH itself is not a weight-loss tool: in euthyroid individuals, taking thyroid hormones does not lead to safe or sustainable weight reduction and carries risks such as palpitations, muscle wasting, and hyperthyroidism. The evidence linking TSH to weight is strong (human-strong), but interpretation is nuanced: a TSH within the reference range does not rule out metabolic issues, and an isolated high TSH without symptoms may not require treatment. Sustainable weight loss relies on caloric deficit, exercise, and, if indicated, medically supervised hormone therapy for overt thyroid disease. Manipulating TSH without a medical indication is dangerous and not recommended.
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