The low body fat levels of marathon runners, ranging from 1% to 8% of body weight, probably reflect an adaptation to long-term training for distance running and a reduced energy intake relative to energy output from intense training.

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Marathon runners typically have low body fat due to the high energy expenditure from their intense and prolonged training, which often exceeds their energy intake, leading to reduced body fat as an adaptation to their sport.

The Low Body Fat Levels of Marathon Runners, Ranging from 1