Following a gall bladder surgery, weight gain should not neccesarily result. You should reduce the intake of fatty foods. Storing fat could possibly result in other cardiovascular complications. You need to take regular exercise, and eat healthy.
I think I answered your question in your other thread. In order to make it easier for us to keep up with your questions, it might be helpful to keep them in the same post, rather than multiple posts.
Gall bladder surgery should not necessarily result in weight gain. Are you getting enough exercise and eating a healthy diet?