Are you hungry? If your stomach is growling, you're probably hungry, which is how you’d describe that uncomfortable feeling in your gut when you go too long without eating food.
Feeling hungry is a gnawing sensation that can be fixed by eating something. For some people, getting food isn’t so easy, and you’ll see poor folk on the street with a hungry look in their eyes. If your hunger has a particular food in mind, you could say that you are "hungry for” that food, like being hungry for macaroni right after seeing a commercial about macaroni.