Muscle mass significantly influences overall calorie expenditure. The more muscle an individual has, the higher their basal metabolic rate (BMR), which is the number of calories burned while at rest. Muscle tissue burns more calories than fat tissue, even during inactivity, which helps in maintaining a healthy weight. Therefore, increasing muscle mass, through strength training and proper nutrition, is crucial for effective weight management and overall metabolic health. This increased calorie burning contributes to fat loss and improved body composition.