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A pound of muscle burns an average of 30-to-50 calories a day, regardless of whether is is being used that particular day. A pound of fat needs less then ten calories a day to maintain itself as fat. More muscle, greater metabolic rate. That is why as people typically get weaker as they get older, their metabolism slows down. Maintain or increase muscle, and your metabolism stays elevated.
Also, metabolic rates obviously changed in the population, otherwise people would not have gotten fatter.
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