The dark blue circles on the left side of the graph show the direct measurements of calorie burn during training and racing.

When ultra-runners lace up for races that stretch hundreds of miles and days, they're not merely testing their mental grit ...

The research, published today in Current Biology, showed that ultramarathoners can burn an astounding 11,000 calories per day ...

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While ultramarathoners are capable of huge energy spurts, overall the athletes top out at 2.5 times the metabolic rate needed for basic body functions.

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