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A calorie is a calorie
"A calorie is a calorie" is a tautology used to convey the speaker's conviction that the concept of the "calorie" is in fact a sufficient way to describe energy content of food.
It has been a commonly cited truism since the early 1960s. The tautological phrase means that regardless of the form of food calorie a person consumes (whether a carbohydrate, protein or fat calorie) the energy chemically extracted from the food, or the work necessary to burn such a calorie, is identical to any other.
== History ==
In 1878, German nutritionist Max Rubner crafted what he called the "isodynamic law". The law claims that the basis of nutrition is the exchange of energy, and was applied to the study of obesity in the early 1900s by Carl von Noorden. Von Noorden had two theories about what caused people to develop obesity. The first simply avowed Rubner's notion that "a calorie is a calorie". The second theorized that obesity development depends on how the body partitions calories for either use or storage.〔
The related concept of "calorie in, calorie out" is contested and despite having become a commonly held and frequently referenced belief in nutritionism, the implications associated with "a calorie is a calorie" are still being debated. The wisdom and effects of skipping meals in an attempt to limit caloric intake is also still largely debated.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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