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Being overweight or obese is the cause of 90-95% of cases of Type 2 Diabetes. https://www.webmd.com/diabetes/diabetes-causes#1

Being overweight usually is tied to overconsumption of calories. Most people don't consume too much fat or protein: it's just difficult to eat a jar of crisco or an entire ham. However, in western cultures, overconsumption of calories is largely associated with highly processed, sugary foods. Chips, soda, snacks, etc.

I will concede that's not the reason for everyone who is overweight, but for many, it is the case. It's predominantly too many carbohydrates.