Muscle mass significantly affects resting metabolic rate (RMR), as muscle tissue requires more energy to maintain than fat tissue. Increased muscle mass elevates RMR, leading to greater caloric expenditure even at rest, which can help with weight management. This enhanced metabolism contributes to overall energy balance, making it easier to maintain or achieve a healthy weight. Additionally, a higher RMR can offset the caloric intake from food, promoting better body composition and overall health.