warum nehme ich trotz kaloriendefizit nicht ab — when to see a doctor?

A calorie deficit does not always guarantee weight loss. Common reasons include: inaccurate tracking of intake or expenditure, metabolic adaptation (basal metabolic rate drops during prolonged deficits), water retention (due to sodium, menstrual cycle, or stress), and medical conditions such as hypothyroidism, PCOS, insulin resistance, or side effects of medications (antidepressants, corticosteroids). Poor sleep and chronic stress raise cortisol, which can impair fat loss. You should see a doctor if the plateau persists for more than 4–6 weeks despite a consistent deficit, or if you experience fatigue, cold intolerance, hair loss, or irregular periods. A physician can check thyroid function (TSH, fT3, fT4), fasting glucose, insulin, and reproductive hormones. Avoid extreme diets or unproven supplements without professional guidance. The evidence here is based on clinical practice, not on direct study data from the provided context.