It always seemed obvious that keeping blood glucose levels as close to normal as possible in diabetes type 1 or diabetes type 2 individuals would prevent diabetes complications. But researchers couldn’t prove it for sure. Then, in 1993. researchers confirmed what many diabetes doctors and people with diabets had long suspected. The Diabetes Control and Complications Trial showed that by keeping blood glucose levels under tight control, people with diabetes can delay or even prevent many of the complications of diabetes disease. The study confirmed that it was the excess sugar in the blood of people with diabetes that caused them to develop complications with their eyes, blood vessels, nerves, and kidneys.