Is FOXO3 useful for Sport?

FOXO3 is a gene primarily associated with longevity and stress resistance. Some GWAS studies have linked certain FOXO3 variants to increased lifespan, but evidence for direct athletic performance enhancement is weak. There is mechanistic plausibility that FOXO3 influences muscle metabolism and recovery, but effect sizes are small and not actionable for personalized training. Consumer DNA tests marketing FOXO3 as a 'sport gene' often overstate its relevance. Genetics play a role in sports, but FOXO3 is not a key determinant. Training, nutrition, and recovery are far more impactful. Without robust clinical trials, the utility of FOXO3 testing for athletes remains speculative. Be cautious of overblown claims: a genetic test alone cannot optimize your sport performance.