Lisa Simpson
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The kilogram calorie is today also called kilocalorie (symbol: kcal). The international standard definition of the term "calorie" (symbol: cal) refers today to the gram calorie; this way, the term kilocalorie can also be interpreted to mean 1000 calories. However, where the term "calorie" is used in nutrition and food labeling, it commonly refers to the kilocalorie.
http://en.wikipedia.org/wiki/Calories