Basal metabolism represents a person's largest expenditure of energy, followed by physical activity and the thermic effect of food.

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Basal metabolism, or basal metabolic rate (BMR), accounts for the majority of an individual's energy expenditure, primarily to maintain vital functions at rest. Physical activity is the next largest energy expenditure, varying greatly among individuals. The thermic effect of food, which is the energy used for digestion, absorption, and metabolism of food, represents the smallest portion of total energy expenditure.

Basal Metabolism Represents a Person's Largest Expenditure of Energy, Followed