It was opposite in my case. When my blood sugar levels were high before being diagnosed, I started to lose weight randomly. I lose about 10kgs without doing anything and eating a lot. Because of high blood sugar, I was always hungry and since I was losing weight, I kept eating a lot, anything and everything. Eventually diagnosed and living with controlled diet now. BMI is 22.
I did some research to see that usually overweights get T2 so was surprised because I lose weight due to T2. Then some more googling and read that weight loss also happens.
I think may be it’s about the genes. My mom has been diabetic for a long time, 20 odd years.