Depends upon the type of Diabetes you have. If you have adult onset type 2 it usually goes away with weight loss.
My mom was diabetic but never on Insulin. While she still had it we modified her diet to keep it under control. Then there was a point where she had lost a LOT of weight - the hospital even said "Don't even mention Diabetes with her, there is no longer a blood sugar problem."
That was my experience, hope it helps.