I always thought that I had a really good, if somewhat overreactive, immune system. While generally pretty healthy, I tend to react badly to midgey bites (immune system overreacting to bites?) and react to silly things like sticking plaster. So I assumed they were all one and the same thing.
But, who knows, the greatest scientific minds still don’t know what really causes diabetes of either type, so I’ll be damned if I know!