I was diagnosed in Feb, but I am from the Caribbean so there goes your theory about the Vit D. Most of us who developed the desease as juveniles had some form of virus prior to diagnosis. It triggers the immune system to destroy the beta cells, causes hypothyroidsm and other autoimmune problems. In my case, it also attacked my liver and ended up with autoimmune hapetitis (I haven't had a bout since I was 17, I am 50). I am the only type 1 in my family. In terms of race, diabetes, in general, is rampant among Native American, African American and Latino communities. However, with that said, most of my problems happened during the winter months in the tropic and here. There were some theories about enzyme changes during that time. The world (animals, tides, etc.) goes through changes with seasons, perhaps we do too. I think that the doctors are pretty clear about the issue of being triggered by the immmune system, however, I don't think they really know the why's. I heard that the finally found the DNA markers for it--there is hope for those who come after us.