No, I'm a biochemist. I need to know the mechanism. The mechanism is important for understanding why and how something happens in a biological system, sorry I just don't take people's word at face value
You could have said something like "eating foods that continuously spike glucose could possibly cause an eventual desensitization to insulin by causing down regulation of insulin receptors"
But you don't get to type 2 diabetes by eating potatoes
If you want to know why it's bad, eat a bunch of sweets and tell me how do you feel after!