I am on the PreOp diet and have gained weight. Before starting, I ate 2 meals a day, breakfast and lunch. Breakfast was a small low-fat yogurt, a little bit of low sugar granola and a banana or some other fruit. Lunch as usually out while at work. Normally places like Luby's, where I never get fried foods. Rarely ever did I get anything fried. I am a big salad lover with a vinegarette dressing. Now that I have been having a little breakfast (2 of what is on the allowed list), a sensible lunch (tilapia or some other sensible meat), and those 2 shakes (made with 8 oz of skim milk), I have gained 2 pounds. I am not eating sweets, I haven't been eating stuff that I shouldn't eat. What is going on? Any ideas?