I think Pat hit the nail on the head here - post surgery, I just ate what I felt would taste good to me at the time. I am usually very diet conscious, and eat mainly lean meats, low fat dairy, vegetables, fruits and whole grains, but many of these things just did not appeal to me for quite a few weeks after the surgery. Don't know if this was emotional (I did not have any tummy problems) or a result of the various drugs given during surgery and the ones I had to take for several weeks afterwards. Anyway, I ate things I never touch normally, like potato chips, french (white) bread and ice cream. Also pounds of grapes. They tasted good too!
Fortunately, I could not pig out enough to gain weight.
Once I got back to feeling more normal, I went back to my regular diet, but tried to make an extra effort to eat lots of leafy greens for the vitamin K, which helps your bones. Also, I do like a good glass of red wine, which I went back to having with my dinner after I had been off the narcotics for a few days. Before that, wine did not appeal to me or agree with me. In addition, I do follow Dr. Gross's recommendations and take a calcium supplement with vitamin D, and a multi-vitamin.
I would say that if you feel like eating a super healthy diet (which I think would consist of lean meats, vegetables, fruits and whole grains) right after surgery, that would probably be optimal for healing. However, in my case, I seem to have healed just fine in spite of eating some junk foods for the first few weeks.