Well, with my doctor, it's a liquid diet, no sugar, low fat. Only steamed veggies, and strained soups. High protien is really stressed! Like protien shakes and such. However, he did tell me today that the liquid is not so much important, as the low sugar, low fat. He stressed that whatever I eat should be healthy... and, the liquid part gets your body ready for post-op I guess. Every doctor has a little bit different pre-op diet. A friend of mine is having surgery the same day, but her diet is like the adkins diet. No breads, carbs, sugars basically.