I don't get it. The unit "calorie" already takes the different compositions of the food into account. It's simply a measure of how much energy a typical person'

I don't get it. The unit "calorie" already takes the different compositions of the food into account. It's simply a measure of how much energy a typical person's body will extract from that specific food. A sugar calorie is completely different from a edamame calorie, but their end result regarding weight loss will be the same. You'll feel completely different from both calories, but your scale won't.