I start my liquid diet next Tuesday and have surgery on 7/17/12. My doctor requires that we loose 15 pounds in that time in order to shrink the size of the liver to make it easier to access the stomach. My wife just had her surgery on Monday and was able to loose 16 pounds during her liquid diet so you should be able to. Good luck.
HW 417 SW 360 CW 251 GW 250 Height 6' 5" Surgery on July 17, 2012