Is it normal to have a bigger belly after a DF?

I completed my 3rd 36h fast this morning. I felt I could carry on, but, coming from 4 years of binge eating, I didn't want to push myself further.

I only had two cups of decaf coffee and 3 eggs. Upon leaving, my belly felt so big that I had to make a new hole on my trouser belt.

I remember something similar happening to me 5-6 years ago when I was doing longer water fasts.

Any clue?