How are MC4R and Sport related?

MC4R encodes the melanocortin 4 receptor, a key regulator of energy homeostasis, appetite, and body weight. Variants in MC4R are among the most common monogenic causes of obesity. In the context of sport, MC4R could influence performance indirectly through its effects on body composition, energy intake, and metabolic efficiency. For example, individuals with certain MC4R variants may have altered satiety signals, potentially affecting their ability to maintain an optimal weight for their sport. However, direct evidence linking specific MC4R SNPs to athletic performance or training response is currently lacking. Most studies focus on obesity risk rather than sport outcomes. Consumer DNA tests may report MC4R variants, but the effect sizes are small and not actionable for training or nutrition personalization. Therefore, while the biological mechanism is plausible, the practical relevance for sport optimization remains unclear. Athletes should rely on established methods like energy balance monitoring and professional coaching rather than genetic testing for MC4R.