I lost 10 lb. during the pre-op diet. I lost 22 post op, but have stopped. I was told to stop my birth control (I don't have periods without them) and missed my period. I have not lost a pound since the week I was supposed to be on my period. I've tracked my calories and am eating between 450-600 a day. I am back on the pills. Hopefully I will start loosing weight again soon!