In short, you cannot, unless you can find a way to make the word defile meaningless...
Mark 7:14-16 (King James Version)
14And when he had called all the people unto him, he said unto them, Hearken unto me every one of you, and understand:
15There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.
16If any man have ears to hear, let him hear.
I have a hub on this subject, it's tough to accept, however the traditional church are WRONG on this matter.
BTW, that was Jesus speaking those words.