I was screened for diabetes (with the dreaded Lucosade) & was not at risk. That was about 5 years before I was diagnosed.
I then had a road accident - overtaking a frog lorry driver (steering wheel on the wrong side) who changed lanes obviously without looking in his mirror. His os front corner hit my ns rear wing & spun my car across the front of his tanker so the main damage was on his ns corner & my ns central door pillar. My car spun from the hard shoulder across all 3 lanes to the centre, & back again across all 3 lanes to the hard shoulder, where a sloping bank guided me back onto the hard shoulder to stop safely.
We weren't hurt, Praise the Lord, & the car was still drivable but we were in a state of shock. That was about 2 years before diagnosis. Stress the cause? I thought so.