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

They’ll vary in size and composition based on their growing conditions so the nutritional value is based on an average. So you will gain an average of that many calories, minus the cost in calories to process the banana into nutrients in your gut which is not factored into the calculation. That “tax” to convert it into usable nutrients will vary from person to person.

So to answer your question, no, but more or less yes.