Taken from https://bible.usccb.org/bible/john/6
I am the bread of life.Then many of his disciples who were listening said, “This saying is hard; who can accept it?”
Since Jesus knew that his disciples were murmuring about this, he said to them, “Does this shock you?As a result of this, many [of] his disciples returned to their former way of life and no longer accompanied him.
Jesus then said to the Twelve, “Do you also want to leave?”
Simon Peter answered him, “Master, to whom shall we go? You have the words of eternal life."
From Catholic Icing ...
https://www.catholicicing.com/teach-the-true-presence-in-the-eucharist-to-kids-an-object-lesson/
From Catholic Central - a 6 minute video suitable for kids
https://www.youtube.com/watch?v=Vm8mMJqta8w
From Catholicism in FOCUS - a video suitable for teens
https://www.youtube.com/watch?v=BBZPv_ImH9w
From Fr. Mike Schmitz at a SEEK Conference - a video suitable for teens and adults
https://www.youtube.com/watch?v=LwwiIkrLxTM
From Dynamic Catholic - a simple 3-minute cartoon
https://www.youtube.com/watch?v=q4QiyQAgP7w
From Catholic Kids Media - a 3-minute video that recounts John Chapter 6
https://www.youtube.com/watch?v=-gKGtlcvvGQ