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Normally there are two types of diabetic disease. Type I (Juvenile diabetes or insulin-dependent diabetes): The reason for type I diabetes is due to pancreas unability to produce insulin. This type of diabetes is usually starts in childhood (childhood diabetes) or adolescence.
Causes of Type 1 Diabetes

The exact cause of Type 1 diabetes is unknown. However, it is known that in majority of Type 1 diabetes cases, the body’s own immune system attacks and destroys the insulin-producing beta cells in the pancreas. Once these cells are destroyed, they cannot make insulin again. So people with Type 1 diabetes need to inject insulin.

The cause of autoimmune system not working properly in such cases is still a subject of research.
Risk Factors That May Cause Type 1 Diabetes

No one knows for certain why this happens, the following are possible risk factors for Type 1 diabetes.

1. Genetics
2. Some viruses like mumps, coxsackie virus, or cytomegalovirus.
3. It has also been observed in some babies who develop jaundice or a respiratory infection just after the birth.
4. Early feeding of cow’s milk to the child has been linked to an increased risk of type 1 diabetes.

Causes of Type 2 Diabetes

Diabetes Type 2 (non insulin dependent diabetes or adult onset diabetes): Diabetes Mellitus Type 2 (Type II) is a result of body tissues becoming resistant to insulin. It generally happens to people above 40 years of age and is usually hereditary.