(Liquid) Calories, how much is really used by the body?
I've been thinking a lot about the actual amount of calories absorbed and used by the body.
Now, I know that foods low in calories also sometimes create a negative calorie balance, because they burn more to be processed than they actually give. But apart from this, how much does get lost on the way in digestion?
Do the 77cals of a small apple really get into the system completely?