warum nehme ich trotz kaloriendefizit zu — what does this mean exactly?

The question 'why do I gain weight despite a calorie deficit' is complex and not directly answered by the provided context. Common explanations include water retention (due to salt, carbs, or hormonal cycles), measurement errors (inaccurate food tracking or scale fluctuations), metabolic adaptation (the body lowers energy expenditure during prolonged deficits), or simultaneous muscle gain while losing fat. The context includes a GWAS finding for rs5400 (A-allele, frequency ~16%) associated with a tiny decrease in fasting glucose (beta -0.022). This could theoretically influence energy metabolism, but the effect is negligible and not clinically meaningful. Other DNA markers mentioned (SIRT1, FADS1, COMT) have no established link to weight changes under a calorie deficit. The evidence is insufficient for personalized advice. Practical steps: use consistent weighing conditions, track calories accurately, ensure adequate protein, and consult a doctor if weight gain persists.