Children are NOT really taught about the Eucharist.  In fact, they are not taught the foggiest notion of it, that is, what constitutes the Transubstantiation, which takes at least some understanding of Aristotle's and Thomas's metaphysics.  That's waaay over the kids' heads, and way over the heads of most people --- unless they take the time to try to understand it.  Unfortunately, Transubstantiation is not taught well to many older Catholics either, with the result that "Real Presence" is mocked here on this ostensibly Catholic site as something involving ghosts and "magic."