This a slightly jazzy Eucharist song from Kate Cuddy in Gather 3rd edition. GIA also note a use for Christ the King, one of the hardest masses for which to find music.
The sheet music is at GIA, where the text is in their preview. It has an short introductory piece before the song proper starts: “I am the living bread from heaven” sung twice, that is not in the guitar version I have.