Diabetes is a chronic disorder caused due to imbalance in Insulin hormone levels in body.
Insulin is a hormone which controls blood glucose level. When any person is diagnosed with diabetes doctors prescribe him insulin to control the blood glucose levels.
From then on diabetes patient should make sure that he eats food which is of low carbohydrate levels. Every time he eat something it becomes mandatory for him to check his blood glucose levels and take insulin injections according to it.
There are other medications other than insulin for diabetes but all the medicines prescribed will control blood sugar level.