It starts out as a wafer and wine and stays the same. When you get communion its still bread and wine, not flesh, furthermore God is a spirit...therefore your objection is weird
So when Christ said "This is my Body", He way lying.
And when God spoke, And lo a voice from heaven, saying, 'This is my beloved Son, in whom I am well pleased' (Matthew 3:17) he used the same "Is" as Jesus did.
It actually is the Body of Christ, or Jesus was not a real man. Only representing a man, or a symbolic man.
Either you take the Bible for what it says, or you apply a tradition of man in explaining the meaning of "is"