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## B

The level of energy expended at rest following an overnight fast is considered the basal metabolic rate (BMR). Thus, BMR describes the lowest amount of energy that must be expended to support the body’s physiological processes. This differs from resting metabolic rate (RMR), also known as resting energy expenditure, only RMR is not always measured following an overnight fast prior to any of the days’ activities. Body weight accounts for approximately 75% of variation among individuals’ BMR, with the level lean body mass being the most important component.