Treatment Increased Survival Rates 42% Diabetes Critically ill patients are more likely to survive when their blood glucose levels are controlled, according to a study.Researchers found intensive insulin therapy to control glucose levels reduced death rates by 42%, even in patients who did not have diabetes.Theory: Optimally controlled glucose levels have beneficial effects on the immune system, which helps protect the body's organs and tissues.If someone you love is critically ill: Talk to his/her doctor about intensive insulin therapy. Want to Keep Reading? Continue reading with a Health Confidential membership. Sign up now Already have an account? Sign in