The Eucharist has become the real flesh of Jesus and the real blood of Jesus. This Eucharistic Miracle has happened in Lanciano in 8th century.
There are other Eucharistic miracles around the world to prove that Jesus is presence in the Holy Eucharist.
In the 8th century, a priest in Lanciano, Italy was experiencing doubts about the real presence of Jesus in the Eucharist. In the middle of saying Mass, he said the words of consecration (“This is my body,” “This is my blood) and saw the bread and wine transform into real human flesh and blood. The blood coagulated into five globules (later believed to be representative of the five wounds of Christ). Word of the miracle quickly spread, the local archbishop launched an investigation, and the Church approved the miracle.
The flesh is still preserved to this day. Professor of anatomy Odoardo Linoli conducted a scientific analysis of the flesh in 1971 and concluded that the flesh was cardiac tissue, the blood appeared to be fresh blood (as opposed to blood that was 1200 years old), and there was no trace of preservatives.
You can visit the miraculous flesh and blood in the Church of San Francesco in Lanciano, Italy.