Evidence check: Longevity DNA Test in the context of Sport

A longevity DNA test in the context of sport typically claims to reveal genetic predispositions for lifespan or athletic performance. The scientific evidence is weak to moderate. The FOXO3 variant rs2764264 is associated with longevity, but the effect is tiny (63% frequency in Europeans) and not causal. For sport, no validated genes directly predict extended lifespan through training. The DIETFITS trial (JAMA 2018) found no benefit of genotype-based diet matching. FADS1 variants for omega-3 conversion have small effects and are ancestry-dependent; a blood omega-3 index is more actionable. Conclusion: Such tests provide interesting but not actionable information. Lifestyle (diet, exercise, sleep) dominates longevity. Evidence: human-moderate (observational/GWAS). Beware of marketing hype.