Have you considered a Nordic-style diet? Not sure what that entails? Well, it includes "healthy foods native to the Nordic climate or foods that can be produced or cultivated in the Nordic climate, like certain fruits, berries, root vegetables, cabbages, whole grains, wild fish and game, potatoes, and rapeseed oil." And in one study, adherence to a Nordic-style diet was found to be correlated with a lower risk of type 2 diabetes. In this study, these six characteristic components of the diet were considered separately, and cabbage was specifically linked to protection from diabetes, but more research is needed before we can say for sure whether cabbage helps prevent diabetes.
Other research has shown that a Nordic-style diet in general may have beneficial effects on diabetes risk factors such as obesity and low-grade inflammation.
Source: Food & Nutrition Research