Fasting Glucose and All-Cause Mortality by Age in Diabetes: A Prospective Cohort Study.

Optimal fasting glucose range for survival is higher in adults with than without known prevalent diabetes, except, perhaps, younger adults. Tight glucose control may lessen premature death in younger adults with diabetes. Hypoglycemia (<65 mg/dL) was associated with higher mortality than was fasting glucose 170-199 mg/dL, while fasting glucose 65-84 mg/dL had risks comparable with those at levels 140-169 mg/dL in diabetes.