To eat His flesh and drink His blood is a striking way of expressing how completely we must bring the Savior into our life—into our very being—that we may be one.
But figuratively eating His flesh and drinking His blood has a further meaning, and that is to internalize the qualities and character of Christ, putting off the natural man and becoming Saints “through the atonement of Christ the Lord.”
Partaking of the Savior’s flesh and drinking His blood means to put out of our lives anything inconsistent with a Christlike character and to make His attributes our own.