We are what we eat as an old saying of men goes.
Jesus told us that if we did not eat his flesh and drink his blood we had no Life in us. Eating anything else, spiritually speaking, will get us to the wrong place, to death that is.
"Through the wrath of the LORD of hosts is the land darkened, and the people shall be as the fuel of the fire: no man shall spare his brother.
And he shall snatch on the right hand, and be hungry; and he shall eat on the left hand, and they shall not be satisfied: they shall eat every man the flesh of his own arm:
Manasseh, Ephraim; and Ephraim, Manasseh: and they together shall be against Judah. For all this his anger is not turned away, but his hand is stretched out still." Isaiah 9:19-21
Our own flesh is our own ways. When we speak of eating our own children, we are doing what? We are eating that which comes forth from our own flesh instead of eating that which comes forth from God, which is Jesus, is it not?
So then we need to read John chapter 6 carefully so we understand what it is that Jesus is saying for as Isaiah wrote in the above verse and a few other places "his hand is stretched out still" is to offer us a better meal than we can obtain from man's world or from his carnal family or from himself.
"Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.
For my flesh is meat indeed, and my blood is drink indeed.
He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him." John 6:53-56