On Deck 9 there's Pluto's Dog House (hot dogs, hamburgers, chicken fingers, fries, etc), Pinocchio's Pizzeria (Pizza and ???), Scoops (soft serve ice cream and fresh fruit), Deck 9 drink station with Coke, Sprite, tea, lemonade. Times vary for these but generally they're open during the day. Topsiders (Beach Blanket on the Wonder) is open for "causal dining" for mealtimes and usually has more flexible hours like lunch till 2:30. Then there's room service ANYTIME for cookies, cheese tray, chickenfingers, and other stuff.
In other words, you WON'T go hungry. Lots more than you can eat.