The bread is symbolic of the body or more accurately the flesh of Christ.
Luke 22:19 And He took bread, gave thanks and broke it, and
gave it to them, saying, 'This is My body which is
given for you; ...'
John 6:31 Our fathers ate the manna in the desert; as it is
written, 'He gave them bread from heaven to eat'.
:32 Then Jesus said to them, "Most assuredly, I say to
you, Moses did not give you the bread from heaven,
but My Father gives you the true bread from heaven.
:33 For the bread of God is He who comes down from heaven
and gives life to the world.
:35 And Jesus said to them, I am the bread of life. He
who comes to Me shall never hunger ...
:48 I am the bread of life.
:50 This is the bread which comes down from heaven, that
one may eat of it and not die.
:51 I am the living bread which came down from heaven. If
anyone eats of this bread, he will live forever; and
the bread that I shall give is My flesh, which I shall
give for the life of the world.
:53 Most assuredly, I say to you, unless you eat the
flesh of the Son of Man and drink His blood, you
have no life in you.
:54 Whoever eats My flesh and drinks My blood has eternal
life, and I will raise him up at the last day.
:55 For My flesh is food indeed, and My blood is drink
:56 He who eats My flesh and drinks My blood abides in Me,
and I in him.
:57 As the living Father sent Me, and I live because of
the Father, so he who feeds on Me will live because
:58 This is the bread which came down from heaven; not as
your fathers ate the manna, and are dead. He who eats
this bread will live forever."
Christ is comparing Himself to the manna which was fed to the children of
Israel. He states that He is the true living bread which descended from
heaven. A bread which brings eternal life.
This 'bread' being His flesh and His blood.
Many hearing these words of Christ took Him literally, so it was necessary
for Him to clarify His message.
John 6:63 It is the Spirit who gives life; the flesh profits
nothing. The words I speak to you are spirit, and
they are life.
John chapter 1 identifies Christ as the 'Word'.
John 1:1 In the beginning was the Word, and the Word was with
God, and the Word was God.
:2 He was in the beginning with God.
:14 And the Word became flesh and dwelt among us, and we
beheld His glory, ...
In Mark 4:13-20 we have the 'parable of the sower'. Notice what is sown.
Mark 4:14 The sower sows the word.
:20 But these are the ones sown on good ground, those
who hear the word, accept it and bear fruit: some
thirtyfold, some sixty, and some a hundred."
These verses make it fairly apparent that the 'body of Christ', also
also described as the 'flesh of Christ' or 'living bread', is actually
the words of God.
The following verse confirms this.
Matt 4:4 ... Man shall not live by bread alone, but by
every word that proceeds from the mouth of God.
The words of God are the true spiritual bread!
When Christ said,
"Take eat; this is My body"
"do this in remembrance of Me",
He was instructing His disciples to EAT THE WORDS OF GOD!