How do I explain the Eucharist?

I have trouble coming up with proof that the Eucharist is really the true body and blood of Jesus Christ. I can tell non-believers what I believe, but it would be nice to have concrete proof in the bible to help me. Can you help? Thanks

These links should be helpful for understanding the Roman Catholic Church’s teachings on transubstantiation. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
Recommended Reading:
The Eucharist IS Scriptural!**
]Transubstantiation for Beginners by Canon Francis J. Ripley
The Glory of Transubstantiation by Abbot Vonier**
]**Real Presence (Fathers)**
]Christ in the Eucharist
]Who Can Receive Communion?
]**Sacrifice of the Mass (Fathers)

*]The Institution of the Mass

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