I have an ileostomy (like a colostomy). When I first got it, I could only eat small amounts of food. I lost 60 lbs. If was wondeful. I'd eat small meals forever and reach my healthy weight.

Well, a few months later my body could easily tolerate more. And I ate more. Gradually at first then more. It wasn't more than six months before I was back to my weight before the operation.

A few months of imposed restriction did not alter a lifetime of habit.

I thought this was something I did wrong and researched it. Turns out it's how the majority of people behave.