There *is* a difference between when Jesus says “THE flesh” (which is associated with worldly and fallen human nature—too many references to count easily, there), and when He says “MY Flesh” (which is the Bread of Life, by whose torture and death He saved the world). Right?
Well, this has never worked before but I’ll give it a try anyway.
To the GREEK, that the NT was written in.
Flesh
Word for *flesh* in: John 6:51, 52, 53, 54, 55, 56
John 6:63
http://biblos.com/john/6-63.htm
The word for *flesh* is the same in BOTH verses.
http://biblesuite.com/greek/4561.htm
sarx: flesh
Short Definition: flesh, body
Definition: flesh, body, human nature, materiality; kindred.
Flesh is the same word He uses in the entire passage, including referring to His own.
Our physical bodies do not cause spiritual realities to happen. They manipulate and use the physical world, not the spiritual one.