I'm also scheduled for surgery on the 2nd. I started my pre-op diet yesterday. On mine I can have 2 soup meals daily (healthy choice etc) sugar free-fat free pudding or yogurt (only 2x a day) and the protein shakes. I tried the Muscle Milk lite, but what an aftertaste!!! Today I used the Wonder Slim which is like the Medifast and its so much better.. so far I'm not craving meat, but it's so hot here in NY that I could go for some ice cream!!!