My mom used to tell me that Jell-o was made from horse hooves. I found out recently that wasn't true but that still doesn't make my stomach feel any more relieved.
A childhood belief about sweeties

others believed things like this
- I used to believe that a vitamin was a small animal
only recently I have found out that it is not true... :)— Sylwia - I used to think dogs had hooves, because they make hoofbeat-like sounds when they walk.— Samuel Lamont
- My mother told me chewing gum was made from horses hooves!Anon
- I used to think that if you ate cat food you would die. I found out it wasn't true
— Bob#4 - THat Cheesecake was actually made of cheese. I was 18 when I found out it wasn't!— R
- I only found out last year that a pony is not a baby horse.— Mescaline Frumblethond