About 70% of a human's total energy expenditure is due to the basal life processes within the organs of the body (see table).
About 20% of one's energy expenditure comes from physical activity and another 10% from thermogenesis, or digestion of food (postprandial thermogenesis).
Energy expenditure breakdown by our human organs
liver 27%
brain 19%
heart 7%
kidneys 10%
skeletal muscle 18%
other organs 19%
Source of information: http://en.wikipedia.org/wiki/Basal_metabolic_rate
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