All "normal" food is included. This is from room service, dining rooms, buffets, deck 9, etc.
What is NOT included is boxed snacks from the bars or outside the theatres or in the gift shops, soft drinks from the bars or room service (soft drinks from the beverage station on deck 9 or in the dining rooms are free). Palo (adults only restaurant, $15 per person charge), smoothies, alcohol.
You can EASILY cruise for a week and not get any food item that is not free. If you want drinks or snacks for a movie or show, get them from deck 9 before you go to the theatre.