Transubstantiation is, according to the teachings of the Catholic Church, the change of substance or essence by which the bread and wine offered in the sacrifice of the sacrament of the Eucharist during the Mass, become, in reality, the body and blood of Jesus Christ. Here are some proofs that the bread and wine actually change to the body and blood of Jesus Christ after consecration.
- Author Tesoriero actually witnessed some tests run by a scientist on a piece of communion bread transformed into actual body tissue, along with Mike Wilesee, a well-known Australian journalist. Wilesee asked the scientist how long white blood cells can remain alive from a piece of human tissue kept in water. Zugibe told them it would last a matter of minutes. When he learned it had been in water for more than three years, Zugibe was amazed and said that the cells from the sample were moving and beating as a heart would, so there was no way to scientifically explain his findings.
- On Aug. 15, 1996, the feast of the Assumption of Mary, a woman approached Father Alejandro Pezet after Mass to report she had found a desecrated Host on a candle holder at the back of the church. The priest followed canon law for proper disposal, putting it in a glass of water to dissolve. Instead, the Host appeared to turn into a bloody piece of meat. Cardinal Antonio Quarracino and our current Pope Francis, then-Auxiliary Bishop Jorge Mario Bergoglio, had it photographed on Sept. 6, 1996. The photographs show a fragment of bloodied flesh that had become larger than a host.
- From the Bible in the gospel of St. John 6:  I am the bread of life.  Your fathers ate the manna in the wilderness, and they died.  This is the bread which comes down from heaven, that a man may eat of it and not die.  I am the living bread which came down from heaven; if anyone eats of this bread, he will live forever; and the bread which I shall give for the life of the world is my flesh.” The Jews then disputed among themselves, saying, “How can this man give us his flesh to eat?”  So Jesus said to them, “Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you;  he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day.  For my flesh is real food, and my blood is real drink.  He who eats my flesh and drinks my blood abides in me, and I in him.  As the living Father sent me, and I live because of the Father, so he who eats me will live because of me.  This is the bread which came down from heaven, not such as the fathers ate and died; he who eats this bread will live forever.”