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The calorie is a pre-SI unit of energy, most common in heat.

It is the amount of energy required to increase the temperature of one gram of water by one Kelvin.

When on a food label, the term "calorie" refers to kilocalories, or 1000 calories.

For a layman, calories are the parameters of your energy consumption. Think of them like the gasoline in your car. But unlike the car, our body stores the excess gas for long.[1]