The term "metabolic rate" refers to the rate at which the body converts food into energy. This process includes both the basal metabolic rate (BMR), which measures the energy expended at rest to maintain vital functions like breathing and circulation, and the total metabolic rate, which accounts for physical activity and digestion. A higher metabolic rate means more calories are burned throughout the day, which can influence weight management and overall health. Factors affecting metabolic rate include age, muscle mass, and hormonal levels, all critical in understanding individual energy needs and body composition.