What role does FT4 play in Abnehmen?

FT4 (free thyroxine) is a thyroid hormone that regulates basal metabolic rate. Low FT4 may indicate hypothyroidism, which slows metabolism and can hinder weight loss. However, FT4 alone is not a direct 'weight loss marker' – weight regulation is multifactorial (calorie balance, activity, genetics, hormones). Even with normal FT4, weight issues can occur. Supplementing thyroid hormones without medical indication is dangerous and can cause thyrotoxicosis. The evidence is based on clinical practice and endocrine guidelines, not on the provided context. For individual assessment, TSH, fT3, and clinical symptoms are required.