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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You can starve while eating all the calories your body needs.
your body doesn’t just need calories but a lot of other things. Calcium, potassium, magnesium, iron for instance. And vitamins of many types.
If you just get calories you give your body stuff to store in your fat tissue but it will still be starved for nutrition (minerals, vitamins, protein). Your body will store all energy you give it (in your fat tissues for instance) but that doesn’t mean your body will have received all it needs.
So on top of those ’empty’ calories (merely calories may be a better way) you will still have to eat a meal that contains all the elements you need to build and repair your body.
a kcal (what we call a calorie) is roughly the energy to heat 1 liter of water by 1 degree. so calories are a measure of energy.
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