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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Your body needs two things from eating: calories and nutrients. Calories are how your body does stuff, and nutrients are the stuff it does it with. Normally, these come together: if you eat, like, a salad, you’re going to get calories but also vitamins and minerals and such like. However, in the case of very processed foods, like drinking sugared soda, you can consume solely calories without getting any nutrients. This is what people refer to as empty calories: any food that is at least reasonably high in calories but which has little to no nutrients in it.
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