I had similar surgery 5 years ago (have a permanent ileo), and as I was severely underweight, my surgeon insisted I eat everything I could get my hands on whilst recovering in hospital (and after), even to the point where he would come in and check to see what I had ordered for my meals "that's not enough you need more!". So I was eating steak, chicken,veges (lots of potatoes), pasta, rice, bread (carb overload basically) and also a protein shake with every meal. The weight soon stacked back on and am currently trying to lose a few pounds so something must have worked!
As you say though, everyone is different, I am fortunate to be able to eat anything I want including popcorn, nuts, seeds, salads, raw veges, etc that many people have probs with. All just a matter of trial and error. Must admit it was an amazing feeling to have a healthy appetite again (after years with Crohn's), not to be on any medication, feel like I can LIVE my life now, instead of simply observing life pass by under a cloud of ill health.