Does anyone at Hogwarts ever eat snacks?

I know there's candies and whatnot, but what if you're hungry at 3pm? If you go into the great hall and sit down, would food appear? How would I get a snack at 9am? Do they have like... Wizard Goldfish crackers? Like maybe giant squid crackers, lol. I'm rarely hungry at "meal times" so Hogwarts might be a problem for me.