Obesity and poor diet together do increase the risk of T2. There is a hereditary aspect to it but T2 is 100% a result of lifestyle or other diseases. People don’t spontaneously develop T2 diabetes without eating too much… and sugar is the primary cause of the metabolic imbalance that results in T2 diabetes. It’s not fucking magic that the A1C level is tied directly to your sugar and simple carbohydrate intake… it is literally the result of using carbohydrates as fuel for your body.