welche diät passt zu mir — what are common causes?

The question 'which diet fits me' has many common causes: genetic variants (e.g., in FTO, PPARG, TCF7L2), gut microbiome composition, metabolic traits (insulin sensitivity, lipid metabolism), food intolerances, personal preferences, and lifestyle factors. Direct-to-consumer DNA tests often market simplified 'diet gene' panels, but most lack clinical validation. Evidence for genetically tailored diets is moderate for a few markers (e.g., lactose intolerance, caffeine metabolism) but weak or mechanistic for complex diets like keto, paleo, or low-carb. No consumer test can fully capture interactions with microbiome, hormones, or medications. A balanced, whole-foods diet rich in vegetables, fiber, and low in processed foods remains the best general recommendation. For specific goals (weight loss, blood sugar control), professional dietary counseling and biomarker testing (e.g., fasting insulin, HbA1c) are more reliable than DNA-based diet claims.