What is a Calorie?

Calorie comes from the Latin, calor, meaning heat. A
Calorie is a measure of heat energy. In many countries, Calories are a measure of the
energy stored in the foods we eat.  A definition for the Calorie is-- the amount of
energy required to raise the temperature of one kilogram of water, one degree Celsius. A
Calorimeter is a device that can determine how many Calories of stored energy a food
has. If one compares the Calories in an equal amount of carbohydrates, proteins and
fats, fats contain the most Calories.