I think vitamin D plays a significant role. My daughter, now a beautiful adult was diagnosed with type 1 diabetes at 8 years old. At the time, her vitamin D level was negligible. Even after taking high doses prescribed by endocrinologists her level remained low. She has since developed other autoimmune diseases. My vitamin D level at diagnosis was very low and I am currently taking extra D. My grandmother had numerous autoimmune diseases and died from cancer. Her D probably low too but those things not checked back in those days. I just think there are a number of pieces to this puzzle