I used to believe that when you ate food, it came alive in your stomach. (remarkably, i pictured it whole, as in before I'd chewed it.) I thought you got that "full" feeling because the food was pushing out on your stomach. I also believed this was how people got fat, because their food pushed too hard.
A childhood belief about eating

others believed things like this
- I always believed as a child your stomach was a big hand which squeezed your food out through your bum....— amc
- We put food in our mouths, so naturally I believed my stomach was in my head.— Timb
- my cousin uded to belive that hiccups were caused by the food in your stomach colliding.— Christine
- I thought when you got food poisoning it might someone had put poison in your food— Bootlebat
- I use to believe that salt would cool food down while pepper would heat your foodAnon
- I used to believe when ordering Chinese food the food and delivery man came from China— Dave