Well, I only lost about 8 pounds in the 2 weeks Optifast diet and I never cheated! But then again, I only have 50 pounds left to loose as I lost 40 pounds on my own since we had the orientation to surgery date. . And yes, there scale is definitely out by about 7 or 8 pounds. Weigh yourself at home before you leave and then when you get home so you know where you're at to start your post op loosing. I am still loosing very,very slowly (1-2 ounds a week) and is quite frustrating as I was loosing just as much on my own before I had surgery. I guess, the good thing this time is, I can't eat as much now, so won't put it back on YEAH! Good luck, Barb C