Im on my third day post op. I can say that I really do not feel that anything has changed. The hospital keep up with the pain meds and I started liquid pain meds as soon as I got home. I think that my pre op diet is the same as my post op for the first week. I can take all my pills whole and i dont feel a change. I was 392 when I started preparing for the surgery and was able to get up to 30 minutes on a walker before the surgery. I would say the more you prepare before surgery both dieting and exercise will help you recover on the other side of it. Im a big beliver in the Optifast meal supplements. If you havent heard about them they would be good to ask about. Made by Nestle and my 18 year old son drinks them as a supplement and likes them even though he dont need to be on any diet.