Confession: I am obsessed with food. I eat about a bazillion times a day (that's a rough estimate). I am not ashamed of stealing cupcakes and cookies and pizza slices from my loved ones. They know I'm a lost cause.
Perhaps it's this obsession with food in my real life that I'm always on the lookout for food in novels. I almost pass out every time I read scenes inside the Great Hall in the Harry Potter series. My tummy went berserk when I not only read about the November cakes in Maggie Stiefvater's The Scorpio Races, but also when I saw BOTH of her posts with the recipe. I've yet to actually make my own November cakes, but it's forthcoming :)
Similar to your main character's Impala, I think food tells your readers a lot about him or her. Do they like sweet stuff? Sour stuff? Spicy stuff? Or are they like me and eat EVERYTHING EVER IN THE UNIVERSE EVER? Perhaps your MC is an aspiring chef, and food is their whole life. Or perhaps your MC is allergic to halibut, but their love interest is all over that halibut. Awkward first dinner date, huh? Or perhaps your villain knows about your MC's allergy, sneaks in bits of halibut in your MC's dish, and OMG I don't even want to finish this sentence.
My point? Food is just another layer of who your characters are. Sure, there are tons of other things that can deepen characterization better, but why pretend food isn't a big deal? I think it totes is. You should, too :)
Now tell me: how do you incorporate food into your manuscript? Do you go about it casually or are there detailed descriptions of yummyness?