Prozac is actually not the best choice when you're anorexic. It can suppress your appetite so it works against you in trying to learn healthier eating habits. If you're taking them because you're afraid to gain weight this is totally the wrong reason to take them. You have to keep in mind too that those two inches you saw are nothing but water retention. Cut down on salt and up your water consumption and you'll see less water retention. My own weight fluctuates up three pounds each month after I ovulate just like clockwork. It's not fat, just normal fluctations in your body's hydration.