Christ said, ‘My body is real food; My blood is real drink.’ Christ is declaring the Eucharist the food necessary for everlasting life. A Catholic Priest is the only person that can create the Eucharist using bread and wine during the Mass.

John 6:51-52, 54-59 I am the living bread which came down from heaven. If any man eat of this bread, he shall live for ever; and the bread that I will give, is my flesh, for the life of the world. Then Jesus said to them: Amen, amen I say unto you: Except you eat the flesh of the Son of man, and drink his blood, you shall not have life in you. He that eateth my flesh, and drinketh my blood, hath everlasting life: and I will raise him up in the last day. For my flesh is meat indeed: and my blood is drink indeed. He that eateth my flesh, and drinketh my blood, abideth in me, and I in him. As the living Father hath sent me, and I live by the Father; so he that eateth me, the same also shall live by me. This is the bread that came down from heaven. Not as your fathers did eat manna, and are dead. He that eateth this bread, shall live for ever.

— Douay-Rheims Version

From the blog: The Eucharist Truth in Action