"For the life of every creature is the blood of it; therefore I have said to the people of Israel, You shall not eat the blood of any creature, for the life of every creature is its blood; whoever eats it shall be cut off." (Leviticus 17:14)If the life of a creature is its blood, then consuming the blood of animals gave you the life of an animal. Those who consumed animal blood were themselves no better than animals, obeying their own passions and living by instinct.
When we consume the blood of Christ, we consume the life of Christ, because the "Life of every creature is its blood."
So Jesus said to them, "Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you; he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. (John 6:53:54)Christ has eternal life. We eat his flesh and drink his blood so that we can live the life of Christ eternally, not the life of a beast, or of an animal, but the eternal life of God.
God reserved the consumption of blood until the perfect flesh and the perfect blood came down from heaven to give life to the world. In this the Law of Moses was fulfilled completely.