What are calories? Is it the amount if energy in a food? How does the body uses calories, burns calories, and how does excess calories becomes fat?
Why are food “low in calories” good for you? Why are food of the same size, have different amount if calories?
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>What are calories? Is it the amount if energy in a food? How does the body uses calories, burns calories, and how does excess calories becomes fat?
>Why are food “low in calories” good for you?
Yes, a “calorie” is just a unit for energy. Things like the Joule, the Wattsecond and the calorie are units for energy in different contexts, just like the meter, the inch and the lightsecond are units for distance in different contexts. But they all express the same property and they can all be used interchangeably.
Energy is an abstraction of the capability to perform [work](https://en.wikipedia.org/wiki/Work_(physics)), which is a bit of a roundabout definition, but it doesn’t get much better than that, I’m afraid. Boiling a liter of room-temperature water, for example, requires a work of about 1 kWh or 3600000 Ws or something like 800000 calories (or 800kcal if you will).
Food that is low in calories is just that: low in energy that is usable by the human body.
Or rather “lower than comparable foodstuffs”. A TicTac isn’t a low calorie food, even though it contains far less energy than a head of lettuce.
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