warum nehme ich zu obwohl ich wenig esse — when to see a doctor?

Gaining weight despite eating little is a common clinical concern with several possible explanations. Metabolic adaptation (e.g., from chronic dieting or muscle loss), hormonal imbalances (hypothyroidism, elevated cortisol, insulin resistance), fluid retention, or medication side effects can all contribute. In some cases, 'low intake' may be underestimated due to hidden calories in drinks, sauces, or snacks. You should see a doctor if weight gain is unexplained, rapid (>2 kg/month), or accompanied by fatigue, cold intolerance, constipation, or mood changes. While DNA tests may reveal variants in genes like SLC2A2 (glucose metabolism) or IL6 (inflammation), their effect on weight is small and not diagnostic. Clinical evaluation (blood work, thyroid panel, fasting glucose) is more informative than direct-to-consumer genetic tests for this issue.