Using the big number of overweight people as a sign that healthy food is available cheap is an amazing feat of backwards logic IMO. A significant cause of overweight is that your diet is too imbalanced and your body is missing certain important nutrients while getting too much of others. That is the exact opposite of healthy food. And in fact, the "cheap food" most people consume is exactly that - fast food and high-calorie snacks. That sounds a lot more like the concrete-bunker-and-ramen theory again...