Found this idea on waygook, thanks to whoever came up with the original game idea! I've used this game with 3rd and 5th graders and they all loved it.
One team starts and whole class asks, "Do you want some more ...." (whatever food pic is on the slide) The team can say, "Yes, please." or "No, thank you." For every "Yes, please." or slide the team gets 1 point, and they go on to the next slide. If they say, "No, thank you." Then it's the next team's turn. Trick is if they get the slide that says, "I'm full." They lose all their points.