I have not had problems losing. Your liver will produce enough bile to digest fats you have consumed. So, no I don't think that not having a gallbladder will affect weight loss. People who have gastric bypass surgery have their gallbladder removed also and they lose just fine.

Are you and your girlfriend the same size? Maybe you need more calories than her. Or maybe you need to eat more fat.

If you post a days worth of meals we may be able to help.