I know 3 people who are most definitley not overweight and are diagnosed type 2. I myself was diagnosed in 2007, and I admittedly was overweight. 18.5 stone and 6ft tall. However, I had been complaining for years about my low blood pressure and slow heart rate, 50bpm at rest. BP 105/45.
I was then reminded by my eldest sister that when I was born in 1956 I was suffering from a condition called Ketone Acidosis, I was not allowed any sugar, low fat diet, no milk, etc. Research on the web told me that this leads to inevitable weight gain in middle age, and lo and behold, inevitable Type 2 Diabetes by middle age. My GP has since done some more research and confirmed that even if I had lived the healthiest life style and was never overweight, it would have not made any difference, I would have become Type 2 and will inevitably become Type 1. There was nothing I could have done to prevent it.
I am now down to 16 stone. Walking an average of 7 miles a day, dogs and golf afterwards. My BP remains 105/45, my at rest pulse 50bpm. However HBAc1s are 6.2, cholesterol 3.9, it was only 5.1 when I was diagnosed, suggested by GP that I take Statins, when I asked why, he then changed his mind and said I did not need to as my cholesterol was normal.
Taking Metformin 500mg and diamicron 30mg once a day.