Help

Hi everyone, Just got back from my pre-op testing and the nurse would not clear me for surgery because I have gained weight. Now the surgeon wants to meet with me to decide if he should cancel or not. They still had me continue with my pre-op testing and start the liquid diet tomorow(my surgery is Mon the 23). Ever since I was cleard a month ago I have been eating what i want knowing i will never be able to eat like this again. Now its back fired in my face. Any advice on how I can convince my surgeon to still go through with the surgery.Thanks in advance Ericka