If a food is said to have 100kcal do we get all of those?

Question

If a banana is said to have 100kcal and you and I eat it are we going to get:

1. all of those calories?

2. the same amount of energy or it varies person to person?

In: Biology

Answer 1

If every digestible carb, fat, and protein in that banana were converted and then oxidized for energy, then you could expect the energy gain to be 100kcals.