TSH (thyroid-stimulating hormone) is a key marker of thyroid function. Elevated TSH indicates hypothyroidism (underactive thyroid), which lowers basal metabolic rate and can lead to weight gain or difficulty losing weight. Low TSH suggests hyperthyroidism (overactive thyroid), often associated with weight loss. However, the relationship is not linear: many individuals with normal TSH still struggle with weight loss because weight regulation is multifactorial (diet, exercise, genetics, hormones). The evidence linking TSH to weight is human-strong, based on endocrine guidelines and large cohort studies. Nevertheless, TSH alone is not a reliable predictor of weight loss success. Medical evaluation is warranted for abnormal values, but weight management should always be holistic. Caveat: subclinical thyroid disorders often have only modest effects on body weight.
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