In the "Hierarchy of Food Needs," Nutrition Comes In Last Place

http://www.fatnutritionist.com/index.php/if-only-poor-people-understood-nutrition/

I don't know how scientific this is, but on the surface, it makes sense. Before we ever consider nutrition (Instrumental food), we must have "Enough" food, "Acceptable" food, "Reliable, ongoing access" to food. Of course, when food is "Good-tasting" - that helps too and strikes us more immediately than how nutritious it is.

With these needs in mind, we can see how the problem of access to healthy foods is exacerbated. On a limited income, people will buy as much of whatever they can afford (and hopefully is good-tasting)...

When you look at the economic breakdown, junk-food is often the more immediate winner.