More and more research pinpoints inflammation as a root cause of type 2 diabetes. Being overweight makes it harder for us to control our diabetes, but that can’t be what causes it. Since a lot more people are overweight or obese than have diabetes, weight alone can’t lead to diabetes.
No one ever demonstrated that obesity causes diabetes or even insulin resistance. In my most recent book, Losing Weight with Your Diabetes Medication, I speculated that essentially it might be the other way around: That what makes so many of us overweight could be insulin resistance or impaired beta cells.
Type 2 diabetes generally results from the combination of impaired beta cell function and insulin resistance acting on susceptible genes. Why then is there such a large overlap between being heavy and type 2 diabetes?