What can happen if you don't control your type 2 diabetes?

I'm not diabetic…..or at least I don't think I am, but one of my friends has type 2 diabetes and he doesn't seem to be doing anything about it. He never checks his blood sugar (I'm NOT diabetic and I check mine) or anything of that sort.

Also, on another note, though I haven't been diagnosed with diabetes, there is a history of it on my mother's side of the family and on top of that, I am over 100 pounds overweight. Just my size alone puts me at risk for the disease.