Diet and exercise will help your appearance no matter what. The problem you might end up having is the loose skin that comes with it. Skin is pretty elastic and will shrink, but I'm not so sure that it would ever be taut to your chest again. Then you have a decision to make: live with loose skin, or get surgery and live with scars. Still, that comes later and for now I'd work on getting in shape, eating right and being healthy. Good luck!