There is a pretty strong causal link between being overweight and diabetes. There is a strong causal link between over-consumption and being overweight. Wheat j

There is a pretty strong causal link between being overweight and diabetes. There is a strong causal link between over-consumption and being overweight. Wheat just happens to be a common source of very simple carbohydrates (in the American diet). So while the GP seems to have been made in jest, it's coming from a place of truth.