If you have Type 1 diabetes, nothing will change. If you have Type 2, it might, depending on your exercise, diet, etc. You need to do some research if you have Type 1. Type 1 and Type 2 diabetes are two completely difference conditions. In fact, there is a movement a foot to change Type 1 to something else. I am all for it so that every middle aged person who has Type 2 doesn't compare themselves to young people or adults who are Type 1.
Being that you asked this question. It makes me wonder what education you received when you were diagnosed. If you do not have a good team together yet, get one. You will need an endocrinologist, a diabetes educator and a nutritionist.
There is no way that you can reverse Type 1 diabetes. You do need to eat and drink a certain amount of carbs to balance out the insulin you are taking. If you are not taking insulin, then you do not have Type 1. If you were just diagnosed, you may be in what is called the "honeymoon" period. That is when your pancreas is still functioning and producing some insulin.
If you are Type 1, I would recommend getting on a pump as soon as possible. Our son has been on one for ten years and he leads a very active and normal life. He eats what he wants, when he wants or doesn't eat if he doesn't want to. He has diabetes, it doesn't have him.
I am very terrified for you. Go on the Children With Diabetes web site and they have a whole section for the newly diagnosed. Good Luck!