Type 2 diabetes mellitus is a condition that can be hereditary or can develop as a result of your lifestyle. In this condition, the pancreas does not produce enough of a substance called insulin or your body is unable to use its own insulin effectively. Insulin works to lower the levels of blood sugar in the body. This inability of the body causes high blood sugar levels, which can lead to medical problems like heart diseases, kidney diseases, blindness, and decreased blood flow in your hands and legs.