Who is Jesus? Jesus himself says:
I am the bread of life.
When the Bible tells us that Jesus is our bread of life, it is because without that bread our spiritual life is not the same, because He is our sustenance, He is who sustains us in all difficult moments.
This bread is very important, this is what sustains us and it is the Word of God, Word of Life, these are true, they are the ones that clarify all the doubts that we have.