I am not a doctor, but i read alot. Ketosis is what we need to do in order to lose weight. It is important that you stay in Ketosis until you lose the weight. This surgery allows you to be able to manage this process by eliminating your hunger whether through hormones or just by feeling full. Down some protien shakes and then cucumbers and you aren't looking at very many calories. Even the doctor said you will be at 500 calories, which would put anyone into Ketosis. While in Ketosis it is important to make sure to stay hydrated and some other blood work needs to be done. I keep hearing 1200 calories and I am thinking to myself...No way and I am 5'10". I was 180, running 5 miles a day at twelve noon in Miami every single day, eating twelve hundred calories and not losing a pound. I couldn't cut anymore than that because I was starving. I didn't know about Ketosis. I am really hoping the the liquid protien supplements are enough to keep my protein up and then I will actually feel full from fruits and vegetables when I am not drinking, and I want to stay around 600 to 800 calories a day. Yor body can go into starvation, but if you eat then it just stores. Ketosis is that place where you are starving, but your body is burning your reserves. Fat people have a lot of reserves I don't know i just can't fathom ever eating 1200 calories ever again in my life. This is all about calorie restriction. If you aren't losing or you are stalling, you are not in Ketosis and you are consuming too many calories. NOT SURE THOUGH. just my thoughts.