Evidence check: DNA Stoffwechseltest in the context of Darmgesundheit

DNA metabolism tests (e.g., MTHFR, vitamin D receptor) are often marketed for gut health, but direct evidence is weak. The analyzed genetic variants typically have small effect sizes and are population-dependent (e.g., lower predictive value in non-European ancestries). An MTHFR variant does not necessarily indicate folate deficiency; blood homocysteine levels are more informative. Gut health involves microbiome composition, inflammation, and nutrient absorption—none of which are directly assessed by DNA tests. Combining DNA results with a stool microbiome test and clinical biomarkers is more evidence-based. Without blood work and professional interpretation, recommendations remain vague and often marketing-driven. Caveat: Do not change diet or supplements based solely on DNA results. Evidence: mixed (GWAS support for some metabolic pathways, but clinical utility for gut health is unclear).