I was diagnosed as diabetic 25 years ago...not an ounce of fat on me then or now...but remained confused about the Type 1/Type 2 labels. Which it was didn't really matter, as I very quickly had to go onto insulin. Consequently, I didn't bother asking my consultant which I had until about a year ago and she virtually said she wasn't too sure!
Thus, I've decided to go with Jennyjoan's definition:
Type 1 - insulin
Type 2 - controlled
So now I have self-diagnosed...I'm a Type 1 diabetic!