Basal Metabolic Rate (BMR)
The basal metabolic rate (BMR) is the minimum amount of energy that must be used to keep the essential bodily activities functioning. These activities include the heartbeat, breathing, body temperature, liver and brain unction, intestinal activity and digestion.
The basal metabolic rate varies between individuals, and is to some extent inherited. Those with a naturally high BMR tend to remain thin despite high food intake, while the reverse is also true.
The BMR uses far more energy (and therefore burns more fat) than even the most vigorous exercise. The BMR is controlled by the brain through the thyroid gland and the hormone thyroxine.