The USDA Economic Research Service just launched a site where one can easily access data that describes a county’s food environment. There are some bugs in the system but this looks like a valuable tool: http://ers.usda.gov/foodatlas/
The link below will take you to a table of data for the Driftless Region counties that I created. ( Ignore that the map link is broken – I can’t seem to fix it. Scroll down and you can see how the counties in the Driftless stack up on any number of food-related indices.