Markie is also correct that we still do not know enough about how
type 1 happens. Probably
type 2 as well. We do know that obesity can diffently cause
type 2, while you will find type 1's, upon diagnoses usually experience weight loss and is not associated with obesity in any way that I have ever heard of.
There have been recent studies that have created a gray area between the two regarding age and developing diabetes.