Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Diabetes ?
    ### Response:
    Type 1 diabetes is an autoimmune disease. In an autoimmune reaction, antibodies, or immune cells, attach to the body's own healthy tissues by mistake, signaling the body to attack them. At present, scientists do not know exactly what causes the body's immune system to attack the insulin-producing cells in the pancreas in people with type 1 diabetes.
    