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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Actually, no energy is being measured.
“Empty calories” is more a NUTRITION phrase than an energy phrase. It is used by health coaches/nutritionists/dietitians to describe foods that have calories, but very few or no nutrients.
Something like potato chips, they have a lot of calories but no other real nutritional value. No vitamins, no minerals (at least not in meaningful amounts.
So those foods have calories, but are empty of other nutrients. So “empty calories”.
Unlike say, an Orange, which has calories and is a supply of vitamin C, as well as a bit of magnesium, calcium, and vitamin B6.
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