Is the Focus on Food Deserts Fruitless?

Stephanie and angela talk about the behavior economics of food deserts. They find that most people who eat generally well, nutritionly, are higher income and higher education. But if it's education which correlates with income, which lead to better nutrition, it also suggests that the arrow may be going in the other direction - a vicious cycle. If there is a way to increase demand for healthy food without making people feel bad, that's going to be the trick. We know that ture and cultural influence is strong, and we know that habit formation is really strong. Is there anything you can pull from your bag of tricks as to how to form a better habit?