When you drink cold water, your body must expend metabolic energy in order to maintain normal body temperature (37â° c) by warming up the water in your stomach. could drinking ice water, then, substitute for exercise as a way to "burn calories? " suppose you expend 286 kilocalories during a brisk hour-long walk. how many liters of ice water (0â° c) would you have to drink in order to use up 286 kilocalories of metabolic energy? for comparison, the stomach can hold about 1 liter.