This happened to me today, and was feeling terrible until I logged on to this site. My surgery was 1/11, and I have lost 20 lbs, including preop diet and first week post-op. On Thursday, I started full-liquids and this morning my wieght is up 1.5 pounds. It is so discouraging, but it is relieving to know I am not alone. It just seems unreal that I can go from eating so many calories in a day, to practically nothing (<600) and gain even a pound.