The bread used for Communion represents His body. It's like a picture of our physical Salvation.
His body was broken for us in a number of ways.--The crown of thorns, the beatings, the stripes, the injuries He suffered, the pain He suffered. He didn't have to suffer all that for our sins, He only had to shed His blood and die for our sins. But His body suffered so that through this, He could also atone for our sicknesses: "By His stripes we are healed!" (Isa.53:5) To save our bodies, it took His body.
The best medicine in the World is the body of Jesus Christ which was broken for our healing! When you partake of the bread, it shows you have faith that His body was broken for your health, so claim His healing by faith when you partake. If we eat of it by faith, we are healed by faith. It's part of His atonement for Salvation for the whole man--body, soul and spirit.
Thank You, Lord, for this bread representing Thy body broken for us and our physical health. As Your body was broken for our healing, so let us have faith to partake of it accordingly, in Jesus' name, amen!