diabetes is a disease where body is unable to use and store glucose. This is a very serious disease but can be controlled under a proper supervision. Typically, after eating the body breaks down food into sugar. An insulin or hormone made in the body acts like a key to open the cells into the body so sugar can enter and later used for energy.
People having diabetes basically have the problem with that key (insulin) and sugar having trouble getting into the cell. There are two types of diabetes Type 1 and Type 2. In the first time of diabetes sugar cannot enter cells people with type 1 diabetes have to take insulin externally.
In the type 2 diabetes there are few reason why body is not using and storing the blood sugar. Lack of keys, and another reason will be the liver is not storing and releasing the sugar properly. The Third basic reason is the locks are not correctly performing with the keys and doors are not opening properly for the sugar to enter into the cell.