Since calorie is a measure of energy, so what does it mean when, for example, alcohol, having “empty calories”? What kind of energy is being measured here?
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Empty calorie means it lacks supplementary required nutritional content.
For example, if you stopped eating, and drank nothing but beer (a common empty calorie trope). Your calorie needs may get met enough for you to maintain your weight, but all other nutrition wouldn’t. So you’d probably die a very, very uncomfortable death despite the fact your diet was *technically* very calorie rich.
Humans don’t just need “calories”. They need a proteins, lipids (mostly fats and oils), carbohydrates, vitamins, minerals, and water.
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