Though the increase is modest, there is some evidence that drinking cold water can cause a slight surge in metabolic rate. Since your body maintains a core temperature around 98.6°F, cold water will be brought to that temperature after being consumed and calories are burned during the warming process. Discovery Healthdeduced that you can burn up to 70 extra calories a day if you follow the common rule of drinking eight 8-ounce glasses of cold water per day. Need another reason to up your water intake? Researchers at the University of Utah found that participants who drank half of the recommended amount of water per day (four 8-ounce glasses), not only showed signs of dehydration, they also experienced a 2% decrease in calories burned per day.