The more the men ran, the greater their loss of body fat.
The more they ran, the greater their increase in food intake.
Thus, those who ran the most ate the most, yet lost the greatest amount of body fat!
I believe that this illustrates the evolution of moderately overweight people to relatively slim individuals via a progressive program of regular exercise. The crucial ingredient is regular, enjoyable activity.
Use of energy by the body falls into two categories. The first is energy used for essential bodily functions digestion, heart beat, breathing and is known as the basal metabolic rate, or BMR. In an average-sized adult, BMR requires about 1400 calories per day.
The second category is energy used for physical activity standing, walking and all other movements. Together with the BMR, it makes up total calorie use, which should be balanced by food intake for weight to remain stable.
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