What to watch with MC4R and longevity?

MC4R (melanocortin 4 receptor) is a key regulator of energy balance and appetite. Variants in this gene are associated with increased obesity risk, which can indirectly affect longevity through conditions like type 2 diabetes or cardiovascular disease. However, direct evidence for MC4R independently influencing lifespan is weak. Most studies come from GWAS on obesity, not longevity. A DNA test for MC4R cannot predict your individual lifespan. The effect of single variants is small and easily overshadowed by lifestyle factors (diet, exercise). Be cautious not to interpret such results as a 'longevity gene' – that would be misleading. MyBody-X includes MC4R in metabolism panels, but the evidence for a direct longevity claim is mechanistic or marketing-driven. Consult a doctor or dietitian before making lifestyle changes based on this genetic information.