Why do you regain the weight lost after being ill?

Question

Let’s say you have the flu and you lose 10 lbs over a week or so due to not being able to eat much. Why do you regain it, especially if you’re eating under maintenance/in a deficit normally?

It can’t all be water if you don’t eat for a week right? That’s a huge deficit.

In: Biology

Answer 1

It really do be mostly water and glycogen. You don’t use much energy while sick so despite not eating much the calories deficit really isn’t that big