Actually, I don't agree that diabetes is a disease of affluence. I'm sure that being a vegetarian in a middle class family with the best of everything is not why I got diabetes.
Whereas, for the first five years of our relationship, on one income, even with an allotment, we were filling up round the edges with spuds, rice, cheap sliced bread, disgusting soya margarine, and potatoes - and ating a lot of soya mince.
I live in a town with 7 supermarkets, 7 locals and zillions of restaurants, takeaways and convenience stores. There's one each of fishmonger butcher, greengrocer, deli, chocolatier.Two bakeries, neither of which bake their bread. No farmers market and in the supermarkets it's not easy to find real meat, as opposed to ready meals. Two aisles of crisps in most of them. Rarely do supermarkets ever have offers on real food. They make more profit flogging ready meals and crisps.
Buying fast food, takeaways, ready meals - that's normal reality.
The low fat experiment failed, ditching cookery classes in schools was a terrible idea, and not enough people continue with sport and exercise after leaving school, because it can be very expensive.