The Ancestral Fitness

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S. Boyd Eaton estimated that ancestral humans spent one-third of their caloric intake on physical activity (1000 cal/day out of the total caloric intake of 3000 cal/day), and that the paleolithic lifestyle was well approximated by the WHO recommendation of the physical activity level of 1.75, or 60 minutes/day of moderate-intensity exercise. L. Cordain estimated that the optimal level of physical activity is on the order of 90 cal/kg/week (900 cal/day for a 70 kg human.)

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