How are MC4R and longevity related?

MC4R (melanocortin 4 receptor) is a key regulator of energy balance and appetite. Genetic variants in MC4R are strongly associated with obesity – a well-known risk factor for many age-related diseases such as cardiovascular disease, diabetes, and certain cancers. Through this indirect pathway, MC4R could theoretically influence lifespan. However, direct evidence linking MC4R to human longevity is scarce. Some GWAS on extreme longevity have not found significant associations with MC4R. Animal studies suggest that reduced MC4R signaling can slow metabolism and extend lifespan, but translatability to humans is unclear. Consumer DNA tests often report MC4R variants (e.g., rs17782313), but their predictive value for individual life expectancy is low. The evidence is mostly mechanistic and GWAS-based, not from human interventional trials. Bottom line: MC4R is relevant for weight management, but a direct longevity marker is not established. A healthy lifestyle has a far greater impact.