Or, you know, it's been the belief of Christians since the beginning.  To quote St. Justin Martyr:

"For not as common bread and common drink do we receive these; but in like manner as Jesus Christ our Savior, having been made flesh by the Word of God, had both flesh and blood for our salvation, so likewise have we been taught that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh"

You do know that most of your beliefs are contrived from the "Spirit of Vatican II" from the 20th century, right?  From things that aren't even in the council documents?