Judging from an examination of Christ's words on the subject of eating Him, it seems apparent that He was refering to taking in the inspired words out of His mouth.
It is His words in His teaching which convey divine life to the receiver. Eating His physical flesh would be of no use. This is what I understand by studying carefully John chapter 6.
After Jesus said this many of the disciples could no longer accept His teaching and withdrew:
"He who eats My flesh and drinks My blood has eternal life, and I will raise Him up in the last day. For My flesh is true food, and My blood is true drink ... As the living Father has sent Me and I live because of the Father, so he who eats Me, he also shall live because of Me ...
Many therefore of His disciples, when they heard this said, This word is hard; who can hear it? (See John 6:54-61)
Jesus then gives explanation to those remaining of His mysterious words:
"It is the Spirit who gives life; the flesh profits nothing; the words which I have spoken to you are spirit and are life ..." (6:63)
To eat and assimilate Jesus Christ is to take into our heart His words. His words embody divine life and the Holy Spirit. When we take into our being His words the essence of divine life is dispensed into our being. We masticate and assimilate Jesus by "eating" Him in His words.
He emphasizes His flesh and His blood because this is God Himself become flesh and blood. It is emphatic that we receive the revelation that Jesus is God incarnate as a man. To eat Him is to totally receive His words as the words of God Himself. The flesh profits nothing. That means that it is not the meat of His physical body which He is teaching us to eat here. It is His words which are spirit and life.
If we eat Him through His words we will also live because of Him. He Himself spiritually will be developed and formed within us. We become compounded with the living and resurrected Christ who became a life giving Spirit to enter into man -
"The last Adam became a life giving Spirit" (1 Cor. 15:45)
Christ today, that is today, is the life giving, life dispensing, life imparting, and life transfusing Spirit. When we take His words and muse and meditate upon them, turning them over and over within our heart, we are masticating Jesus. His spirit embodied words will cause the life giving Spirit to impart the very Christ into out being so that we can live because of Him.
Remember, Jesus rose on the third day according to the Scriptures.