🧬 FOXO3: stress-activated longevity gene (consistently associated with human lifespan)
Growth signals (insulin/IGF-1) → FOXO3 stays in cytoplasm
Stress/fasting → FOXO3 → nucleus → turns on:
• DNA repair (GADD45)
• Antioxidants (SOD2)
• Autophagy (LC3)
Genetic variants = longevity predictor

