Catholic doctrine has always held that, upon consecration at Mass, Christ becomes truly and substantially present in the bread and wine on the altar.
Over the centuries, however, there have been numerous reports of consecrated Hosts literally turning to physical flesh and blood.
One such miracle happened in 8th Century Lanciano, where a priest who was doubting the Real Presence of Christ in the Eucharist saw the bread and wine transform into human flesh and blood as he said the words of consecration.
