Diabetes is a condition of high blood sugar. To learn to manage diabetes well you will learn as to what are normal blood glucose levels, how they are maintained and what happens when the blood glucose becomes high or low. Understanding that will help you identify complications of diabetes early and take the corrective action in time. Will you like to hold a crystal ball that can give you some idea about your future health? Well we have one now. A1C is the second most important number a diabetic should know about. This single number predicts chances of the diabetic patient getting retinal damage (blindness), kidney damage (needing dialysis or transplant), heart attach, stroke, high hospitalisation, high medical expenses. Understanding this number and managing it well will help the patient decrease not only expenses for his or her diabetes but will also help live a healthier life for a longer period of time.