While the exact causes of type 2 diabetes are unknown, the result is still that the pancreas does not create enough insulin or the body does not know how to properly get rid of insulin excess. If either of these problems arises then you become diabetic. Type 1 diabetes often is found in childhood and is when the pancreas does not make enough insulin, so shots must be taken to help the body keep up with the demand. Type 2 diabetes is a huge problem with morbidly obese people, and when it is first diagnosed, can often be kept under control with diet and exercise. When a patient does not lose weight and continues to eat an unhealthy diet, the diabetes gets to the point where it must be managed with prescription medications.
There are many symptoms of type 2 diabetes, and if these symptoms are ignored or not recognized it can lead to death. Type 2 diabetes is a growing problem in the United States as the number of morbidly obese people increases. There are many on-going studies right now that are researching the positive effects between gastric bypass surgery and remission of type 2 diabetes. While they cannot call surgery a cure for type 2 diabetes, many patients are able to stop taking their prescriptions days or weeks after surgery and never go back on them.
My information on type 2 diabetes came from this website