Myths vs facts: FOXO3 and longevity

FOXO3 is one of the most consistently replicated genes in longevity research. Specific variants (e.g., rs2802292) have been associated with a higher likelihood of reaching extreme old age, especially in centenarian studies. **Myth:** Having the 'good' FOXO3 variant guarantees a long life. **Fact:** The effect size is modest; the variant accounts for only a tiny fraction of longevity. Lifestyle, diet, environment, and chance are far more influential. Moreover, FOXO3 is not a modifiable target – you cannot change your gene. A consumer DNA test for FOXO3 therefore offers no actionable guidance. The evidence is human-strong from multiple GWAS and candidate gene studies, but individual prediction remains weak. For health optimization, focus on proven lifestyle factors rather than a single genetic marker.