What role does MC4R play in longevity?

MC4R (melanocortin-4 receptor) is a key regulator of energy balance and appetite. Genetic variants (e.g., rs17782313) are strongly associated with obesity in GWAS (p<5e-8, effect ~0.5 BMI units per risk allele). However, a direct role in longevity is not established. Indirectly, MC4R may influence aging through metabolic pathways (insulin sensitivity, inflammation, oxidative stress) – but this remains largely mechanistic or derived from animal models. Human lifespan studies are lacking. Consumer DNA tests (e.g., MyBody-X NutriCare) analyze MC4R variants, but results are insufficient for personalized longevity advice. Evidence is limited to association studies; no clinical interventions targeting MC4R exist for healthy individuals. Conclusion: MC4R plays a role in weight regulation, which can affect life expectancy, but it is not a validated longevity marker. Beware of overblown marketing claims.