When you drink cold water, your body must expend metabolic energy in order to maintain normal body temperature (37° 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 383 kilocalories during a brisk hour-long walk. How many liters of ice water (0° C) would you have to drink in order to use up 383 kilocalories of metabolic energy? For comparison, the stomach can hold about 1 liter.
liters
Then Heat lost by the body is ,
mc water (T ice - T body)
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