Speaking only for myself...
During an acute medical procedure, about twelve years ago, to stop my immune system from rabidly attacking my intestinal walls, the doctor used huge doses of Prednisone. It seemed like the indicated medical thing to do at the time. It worked, but soon my numbers shot up.
At first, I could control my glucose by jogging and avoiding French Fries, having a salad. I was young (+/-) and had options for burning off numbers. I was empowered by the idea that I really could run off my numbers. But I remember thinking, my numbers were already out of wack, Right from the beginning. Maybe the steroid destroyed by beta cells. I don't know.
Now I am coming up on 58 years old and I cannot jog like I used to. I enjoy life, but I am sliwer now. I shoot two kinds of insulin and eat one pill, just to manage the T2-other that I have.
Pre-diabetes for me lasted a little longer than 45 years.