It is very important to keep the Glucose level normal in the body and one need to understand the role of diet in maintaining the level in the body.
One has to balance the level through medication and diet. Medication tries to bring down the sugar level and food brings up the sugar level. Over the years, if you know the caloric value of the food items and its quantity, you can take good control of the blood sugar level and if properly followed, you may not even need medicines to bring down the glucose level. This may not happen in real sense, because of obvious reasons but it is always good to understand the caloric value.
Apart from this, there are many food items that are of high caloric and low caloric index. You need to consult your doctor and a dietitian to plan and bring disciplined practice.