From my own personal experience, might not apply to anybody else:
Before I started on the IP protocol, I was pigging out every day, especially in the evening... I thought my stomach had to be full all the time, & it felt weird if it wasn't... I doubt I had actually been really, physically hungry in many, many years... so, when I started IP, it took me a while to get used to not being stuffed 24/7... I can't really remember when I got used to the feeling of having an empty stomach, but somewhere along the line I did & it really isn't at all uncomfortable to me anymore... I finally realized that having an empty stomach & being hungry are actually two different phenomena... sure, I still have cravings, but those are mental or emotional things, rarely a physical thing...
hugs
P.S. Just wanted to add this... IP is as much about retraining the mind as it is about retraining the body... I've quoted this before, but it still means a lot to me:
A permanent solution takes hard, smart work & sacrifice on your part... human nature always seeks the path of least resistance...