What to watch with FOXO3 and fatigue?

The FOXO3 variant rs2764264 (T allele) is linked to a modest increase in longevity odds in GWAS, but there is no direct evidence connecting it to fatigue. Fatigue is complex—sleep, stress, nutrition, exercise, and other genetic factors (e.g., COMT Val158Met) are more influential. MyBody-X tests FOXO3 but not mTOR or AMPK markers, which are more relevant for energy metabolism. A microbiome test may reveal dysbiosis-related inflammation that can contribute to fatigue. Caveat: a single SNP cannot predict lifespan or exhaustion. For fatigue, consider biomarkers like IGF-1, insulin, or thyroid hormones (see Menopause Check). Evidence: GWAS for longevity, but for fatigue it is unclear. Always consult a clinician for persistent symptoms.