Eat fat-free or low-fat dairy products such as cheese or frozen yogurt. Keto Burn Advantage A calorie is the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius. A kilocalorie is the amount of energy needed to raise the temperature of 1 kilogram of water by 1 degree Celsius. The average person uses as many as 2,500 calories daily, or 17,500 calories per week.