What we put in our minds matters and what we put into our bodies matters. What we put into each, changes us. When you surround your mind with what we perceive as good and true and beautiful, it influences our desire to pursue that in life. St. Paul wrote about this in Philippians 4:8 "Whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is gracious, if there is any excellence, if there is anything worthy of praise, think about these things".
So think about Jesus. Don't just think about Jesus, be Jesus. When we receive Eucharist, Jesus then resides in us. Total perfection becomes one with you. You are made perfect! This is the most profound union we can have with our God here on earth. Dr. Edward Sri makes the point as it relates to the mind, "When we come back to our pews after receiving Holy Communion, it is not the time to look around and see who's at Mass, or daydream about the football game in the afternoon, or develop our 'parking lot exit strategy'. And, it's certainly not appropriate to leave before Mass is over. This is the most intimate time we have with our God - to talk to him from the depths of our hearts. As he is lovingly dwelling within us, we should use these profound moments to tell him we love him, to thank him for blessings in our lives, to pour out our hearts to him with whatever may be troubling us, and to quietly rest in his love and listen to him."
Fill your mind with what matters so that the body follows.