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What is a calorie?

What is a calorie? Here are some definitions.

Noun
  1. (physics) The gram calorie or small calorie, a non-SI unit of energy, equivalent to approximately 4.2 joules. This unit was widely used in chemistry and physics, being the amount of energy needed to raise the temperature of 1 gram of water by 1 °C.
  2. (nutrition) Kilogram calorie or large calorie. A unit of energy 1000 times larger than the gram calorie. It is equivalent to the gram kilocalorie, approximately 4.2 kilojoules.
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Conventional dietetic advice is usually to avoid snacking between meals, on the basis that this just adds to the calorie count for the day.
In scientific terms, 1 calorie is a kilocalorie, which is the amount of energy required to raise 1 gram of water 1 degree Celsius.
To meet the calorie needs of growing muscles, bodybuilders must eat a lot more food than the average Joe.
The gene mutation appears to work by restricting calorie absorption at the cellular level.
The result is that extra calorie that might otherwise be stored as fat in the body are burned up and the person who dances remains slim and trim.
Maybe I had picked up the wrong gadget, and it was a calorie counter, primed to record a Big Mac and fries.

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