My diseases progression mirrors the one I described, with gradual beta cell loss over time, but it was long ago when I was 17 - I’m 60 - and the only trigger that I’ve read is I could consider, other than the standard autoantibody one, is stress.
I entered a detox unit for a short-term mental health issue for two weeks, although not drug-related. My health was fine, but after getting out, a short time later, I asked to go back in - nothing scary, just didn’t feel right. They redid my urine and they found sugar, and that hadn’t been there before, with a GTT to confirm.
From what I remember, my BS was never insanely high, at first high-hundreds, then later in the 200’s, but the doctor, by specialty a neurosurgeon, gave me drugs for Type 2’s, even though on appearance, at 6’4" and 170 lbs, one would assume a Type 1, and if he did treat me correctly I believe he might have preserved my pancreas, at least a bit. I went off to college, and the endocrinologist I was given, somewhat accusatorially, told me I had to go on insulin, if not in 6 months then in 2 years. I wasn’t fighting him, but I did not take care of myself back then.
Anyway, after about 18 months i had lost 35 lbs and was sitting on bones. I looked like I was in Auschwitz, no disrespect for the people that truly suffered, just skin and bones. I was hospitalized and put on insulin. After that, well, you know how it goes…