Do you have any sources to prove the midwest eats a lot of meat and cheese? Do you have any sources to prove that matters?
Of course that doesn't account for population density, but if you take a look at http://www.wolframalpha.com/input/?i=populations+of+LA%2C+sa... you can see that the Midwest certainly has a higher per-capita rate of McDonald's.
(I realize this is not much better than anecdotal.)