When monitoring TSH (thyroid-stimulating hormone) in the context of weight loss, several key points matter. TSH is a first-line screening marker for thyroid function, but it is not sufficient alone. Elevated TSH (>2.5–4.0 mU/L depending on lab) may indicate subclinical or overt hypothyroidism, which lowers basal metabolic rate and can hinder weight loss. However, TSH alone can be misleading: free T3, free T4, and thyroid antibodies (TPO-Ab, Tg-Ab) provide a more complete picture. Even with normal TSH, low fT3 (euthyroid sick syndrome or functional hypothyroidism) can impair metabolism. Important: hypothyroidism should be medically diagnosed and treated (e.g., levothyroxine) before starting a weight-loss diet. Self-supplementing with iodine or selenium without proper diagnosis can be harmful. Additionally, factors like chronic stress, severe calorie restriction, and poor sleep can alter TSH secretion. A holistic approach with medical supervision is recommended. MyBody-X does not offer TSH testing; for thyroid parameters, standard lab tests through a physician or certified lab are appropriate.
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