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

Several factors can explain a weight loss plateau despite exercise and a calorie deficit. Metabolic adaptation is common: prolonged restriction lowers resting energy expenditure. Water retention from muscle repair, inflammation, or hormonal shifts (thyroid, cortisol) can mask fat loss. Additionally, calorie tracking and exercise expenditure estimates are often inaccurate—fitness trackers tend to overestimate burn. When to see a doctor? If after 4–6 weeks of consistent deficit (300–500 kcal/day) and regular exercise you see no change, or if you experience fatigue, hair loss, cold intolerance, or menstrual irregularities. A physician can check thyroid function (TSH, fT3, fT4), fasting glucose, insulin resistance (HOMA-IR), and inflammatory markers. Also consider medications that may cause weight retention. Evidence is practice-based; no direct genetic markers from the provided context apply. Avoid extreme deficits; prioritize protein and sleep.