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

Depends on metabolic efficiency so expect losses there. Fiber funnily enough doesn’t get counted as kcal, but some gets broken up into fatty chains and are therefore somewhat caloric albeit negligible and far outweighed by metabolic (in) efficiency.