Pre-diabetes is a condition of mild glucose elevations but not high enough to meet the diagnostic criteria of type 2 diabetes. The diagnosis of pre-diabetes is defined as a fasting glucose of 100-125 mg/dl or a 2 hour after a 75 gram glucose load glucose during an oral glucose tolerance test of 140-200 mg/dl. Preventing the progression to diabetes is rather straight forward. It is all about diet, weight loss, and exercise.