What you are really contending with is the stigma associated with the word “cannibalism”. Murder, gore, horrendous criminals. There are many Catholic writers that insist that eating Christ’s flesh isn’t cannibalism, but they do this by playing with the definition of cannibalism itself (ie, they say that cannibalism is defined as a murderer eating the murdered, or that a cannibal only eats dead flesh whereas the Eucharist is living - but these are incorrect, as the definition of cannibalism is indiscriminately eating any flesh of the same species).
As well as this, I have also known people that have misunderstood these sort of teachings and have come to falsely understand that the “Eucharist is spiritual food and not physical”- but of course this is flat wrong, as the Eucharist is both spiritual and physical flesh. This way of thinking leads very easily if not directly into consubstantiation.
I’m not an educator of children (yet), but I would steer clear of these explanations - particularly for youngsters.
What I would think of doing, is this:
- Teach them about the story of the pelicans*
- Teach them that the Eucharist is real flesh, but that it is also more than that, as they will receive also the Soul & Divinity of Our Lord.
- That God has allowed it to retain the look and feel of bread in order to make it easier for us to receive.
- That although the Eucharist is flesh, the word cannibalism is a very irreverent word to associate with it - as God gives us this amazing gift because He loves us so much, whereas when we use that word it makes us think of evil.
*Pelicans were widely understood in olden times to provide for their critically starving young by opening a wound in their chest to feed them with. This could either be a very rare and rarely seen trait of those birds, something that had been observed by somebody at some time, or folklore, but nevertheless it is a warm story and a good image to associate. It is possible that you may even have this icon somewhere in your local Chapel representing Jesus, this would be an extra teaching aid if so.
I hope this helps!
http://www.stfaithsgreatcrosby.org.uk/pelican2.jpg