Truth in a nutshell, nobody knows what causes Type 1 sugar diabetes. There is no definite points of development for Type 1 sugar diabetes. Unfortunately, Type 1 sugar diabetes is averagely diagnosed well after all the major damage was already done. As many other thyroid disorders, Type 1 diabetes is an autoimmune disorder. Same as in other similar disorders, such as lupus, multiple sclerosis, or rheumatoid arthritis, the immune ssytem wrongfully tags healthy parts of the body as alien and therefore attack them, destroying cells. In sugar di abetes, the person’s immune system attacks and destroys the very important insulin-producing beta cells in the pancreas. Scientists don’t know why does it happen or how to prevent it from happening. But they identified two main causes behind this abnormal autoimmune response.