Americans have an appetite for a quick bite. This is especially true in college towns where students need to refuel between classes.
Fast food restaurants have a history of serving low quality food. Fortunately some restaurants are improving their menus and a new genre of restaurant is serving fast casual food. These restaurants serve traditional or gourmet fare in a fast setting.
The fast casual restaurants make it difficult to categorize restaurants.
NOTE: I put pizza joints in their own category.