MyBody-X angle on Ballaststoffe Genetik

Claims that a DNA test like MyBody-X can personalize optimal fiber intake are not scientifically supported. While certain SNPs (e.g., in TAS2R38 affecting bitter taste) may indirectly influence food choices and thus fiber consumption, no direct, clinically relevant genetic variants for fiber requirements have been validated. Existing evidence is mostly from GWAS with small effect sizes, and no RCTs demonstrate benefit from genotype-based fiber recommendations. Effects are also ancestry-dependent. Evidence grade: unclear/gwas. Consumers should rely on general guidelines (e.g., 30 g fiber/day) and personal tolerance rather than genetic tests. Consulting a doctor or dietitian before major dietary changes is recommended.