Myths vs facts: DNA Stoffwechselanalyse | inkl. 28-Tage-Plan & Rezeptbuch and Fruchtbarkeit

DNA-based metabolism and fertility tests are often marketed as revolutionary, but the scientific reality is more sobering. Many direct-to-consumer (DTC) tests claim to predict metabolism or fertility based on single gene variants (e.g., MTHFR, MC4R, VDR). In truth, common variants like MTHFR C677T have only a small effect on homocysteine levels, usually manageable with adequate folate intake. Rare MC4R mutations can cause severe obesity, but DTC tests rarely detect these. For fertility, single-point hormone measurements (e.g., estradiol, progesterone) have limited diagnostic power because reference ranges vary greatly with cycle phase. A 28-day plan with a recipe book can be motivating but does not replace individualized medical advice. The evidence is mixed: some genetic associations are validated (e.g., APOA5 for triglycerides), but effect sizes are small and dominated by lifestyle factors. Consumers should be wary of claims based on single SNPs and instead rely on validated biomarkers and clinical guidance.