Catholic believe that after priest says the words of consecration over the bread and wine they become the real body and blood of Jesus Christ. It is his resurrected body so the outward form still appears and tastes like bread and wine. This is a hard belief for man and throughout the history of the Church there have been numerous Eucharistic miracles. The miracles usually confirm the belief of Jesus true presence by physically becoming flesh for all to see. Here is one of the most recent