Evidence check: FADS1 in the context of Müdigkeit

The evidence for a direct link between FADS1 variants and fatigue is weak and primarily mechanistic. FADS1 encodes delta-5 desaturase, a key enzyme in omega-3 and omega-6 fatty acid metabolism. Certain variants (e.g., rs174547) can alter enzyme activity, shifting the balance toward pro-inflammatory fatty acids. Chronic low-grade inflammation is a known contributor to fatigue, but no robust clinical trials directly connect FADS1 genotypes to subjective tiredness. Most data come from GWAS on blood fatty acid levels, not fatigue endpoints. Thus, using a consumer DNA test for FADS1 to explain fatigue is not evidence-based. Lifestyle factors (sleep, diet, stress, thyroid function) are far more influential. A blood test measuring fatty acid profiles or inflammatory markers would provide more actionable information. Be cautious of marketing claims that extrapolate mechanistic findings to clinical recommendations without human validation.