If we are walking as we ought, we too should be changing daily. That too is not a change visible to mortal eyes. Could I observe it if your mind is being transformed or transfigured?
Romans 12:1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.
2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
3 For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
4 For as we have many members in one body, and all members have not the same office:
5 So we, being many, are one body in Christ, and every one members one of another.
Yes, I read that as referring to how Christians should conduct themselves, and especially so before partaking of Communion. Care should be taken to have a clear conscience. Christians are doing more than remembering the sacrifice of Jesus; they are also offering themselves as living sacrifices themselves. Care needs to be taken to be rid the self of any known flaws or blemishes. Do this, and especially before Communion, and then the various members of the Body of Christ can come together as they ought.
Now if you have attended Communion in Protestant churches, perhaps there was no real change in the bread and wine. I hope this is the case for then people with consciences not quite clean could not be risking damnation by partaking unworthily, not discerning the Lord's Body was "really" there.
1 Corinthians 11:29 For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body.
If it remained mere bread and wine, how could anyone be risking damnation?