A calorie is a unit used to calculate the amount of energy consumed by the body

If we burn off more energy than we replenish, we'll lose weight.So we have to be able to measure the energy we consume and use,and we do so with a unit called the calorie.One calorie, the kind we measure in food,also called a large calorie,is defined as the amount of energy it would take to raise the temperature of one kilogram of water by one degree Celsius.Everything we consume has a calorie count,a measure of how much energy the item stores in its chemical bonds.