Metabolism plays a critical role in energy expenditure, as it encompasses the processes by which your body converts food into energy. This process includes both catabolism (breaking down molecules for energy) and anabolism (building up components). A higher metabolic rate means that your body burns calories more efficiently, even at rest. Factors influencing metabolism include age, muscle mass, and activity level. Consequently, individuals with a faster metabolism expend more energy, which can assist in weight management. Understanding how metabolism works is essential for optimizing dietary and fitness strategies.