To eat this bread is to take a revealed state fully into yourself and make it your own, the way food becomes your body. The living bread is your own awareness of being, come down from the unseen to feed the man who accepts it. Eating is not admiring a thing outside you; it is swallowing it until it is you, until the state you assumed is no longer a claim but your flesh.
The life given for the world is the state you become, offered because the world you see is yourself pushed out into view. What you accept inwardly, you give outwardly. A man lives forever in whatever he has eaten in this sense, whatever he has taken as his own being. The feeding meant is the quiet acceptance of the desired state as already yours, held until it is bone of your bone and shows as your life.