You haven't eaten in a little while, and your body needs fuel. It's time for breakfast, lunch, or dinner.
If there's a specific food you want, it's okay to eat it! You don't have to eat perfectly healthy all the time-- no one does! Just also use your brain a little, and notice the quantity you're eating, and how healthy it is for you. You're probably just fine at trusting your gut and knowing what your body needs.