Defilement Comes from Within

In this episode, we look at Mark 7:14-23 where Jesus says, "Do you not see that whatever goes into a person from outside cannot defile him, since it enters not his heart but his stomach, and is expelled?" In saying this, did Jesus intend to abrogate Old Testament dietary restrictions? If what goes into a person cannot defile him, what was the purpose of the Old Testament laws regarding unclean foods?