Use of energy by the body falls into two categories. The first is energy used for essential bodily functionsdigestion, heart beat, breathingand is known as the basal metabolic rate, or BMR. In an average-sized adult, BMR requires about 1400 calories per day.
The second category is energy used for physical activitystanding, walking and all other movements. Together with the BMR, it makes up total calorie use, which should be balanced by food intake for weight to remain stable.
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