Recent quotes:

Adrian Ballinger, Cory Richards diet for Everest climb - Sports Illustrated

Ballinger’s body switched from burning mostly fats to mostly carbohydrates at a heart rate of around 115 beats per minute. According to Van Sickle, considering the average person, “you’ve got 1,500 calories worth of carbohydrates stored up at any given time, you’ve got 50,000 calories worth of fat.” At even a moderate training intensity, Ballinger was quickly burning through the energy stores his body was best adapted to use.