He was brittle stage. Spent many nights on his sofa checking his blood sugar and adjusting his diet at 3 AM. His daughter talked him into having his second leg removed. He was too weak for that at the time, I think. They gave him the wrong meds after surgery, which is what actually killed him. Woman was standing in for the surgeon and did not even look into his books.
Watch that diet, and keep a good attitude: it helps to fight it.