Setting is, as we all know, quite important to a story. And what's part of setting? Food. Not just what's available/popular in a region, but what it's called. (For example, pop vs. soda and funnel cake vs. fried dough.) Food might stand out if a character finds himself/herself in a new area--for example, when I was in Tennessee this summer there was fried pie at the Fourth of July fair. (Actually, a lot of things were fried.) But fried pie? Totally caused a double-take. Or, if the character is in a usual setting, food can be worked in to enhance the sensory appeals of the story. Let's face it, sight and sound are used to death. How about taste and scent?
I challenge you to look up your state (or area) on Wikipedia and read the food section. Under the Pennsylvania page were foods I didn't know were traditional PA delicacies (pretzels, chips), food I definitely would've guessed (chocolate, go Hershey!), and even some food I've honestly never heard of (what's chow-chow?).
Also, including food gives you an awesome new aspect of your setting to research...preferably hands-on!