warum nehme ich trotz sport und kaloriendefizit nicht ab — what can you do yourself?

Not losing weight despite exercise and a calorie deficit is a common frustration. The reasons are usually multifactorial: the deficit may be overestimated (inaccurate tracking, hidden calories in drinks or sauces), or your metabolic rate adapts downward during dieting (metabolic adaptation). Water retention, poor sleep, stress (elevated cortisol), and hormonal fluctuations can also mask fat loss. Genetic variants like ADRB3 Trp64Arg (rs4994) have a small effect on energy expenditure, but the effect size is minor and lifestyle factors dominate. What you can do yourself: keep a precise food diary (weigh portions, don't estimate), adjust your deficit moderately (300–500 kcal below maintenance), include resistance training to preserve muscle, prioritize sleep and stress reduction, and be patient – real body composition changes take weeks. If weight loss stalls for more than 4–6 weeks despite consistent tracking, consider consulting a doctor to rule out thyroid issues or insulin resistance.