Once diabetic, always diabetic, and
once you hit that point, damage (to the
pancreas and the
rest of the
body) occurs inevitably, even with PERFECT glucose control (which you won't be able to maintain, as more and more beta cells die).
Stop diabetes before it attacks. Exercise (with medical permission).
Diabetes is worse than heart disease in my opinion. It kills you bit by agonizing bit. And it is relentless. I've seen it firsthand (thankfully I personally have avoided it).