In the Old Testament, God forbid the partaking of any blood from any creature of the earth…it was to be sacrificed on an altar if taken from an animal killed for food because blood is what gives life to the body (I think this is Leviticus 3:17 and more completely on Leviticus 17:10-14).
Jesus Christ isn’t some creature of earth. He’s the Son of Man…the true sacrifice, the true food and drink. I believe God was not only trying to keep His followers from murder or useless killing, He was also reserving partaking in this most holy sacrifice for His Son and His Son alone.
That might help a little with the cannibalism part…as for Christ still looking and tasting like bread and wine, of course!!! What kind of faith would we have if it looked like flesh and tasted like blood? “Blessed are those who have not seen, but have believed” When everything in the whole world, all of your senses and all of your logical reasoning tells you that that is not flesh and blood, you STILL believe…that is true faith and true mystery…and I am so greatful that Christ made it like that