I had surgery on Sept. 4th. I had to be on liquids for 10 days prior to surgery. My surgery center sent me 3 cases of Optifast, a high protein, low calorie drink that comes in vanilla, chocolate, and strawberry. I had to drink 6-8 per day. That is all I could have other than clear liquids, sf of course. And sf jello, popsicles, stuff like that. I lost 16 pounds prior to surgery and 32 so far total. I have my first fill on October 9th.