The Eucharist is the Food for the Journey

"But the angel of the LORD came back a second time, touched him, and said, “Get up and eat or the journey will be too much for you!
He got up, ate, and drank; then strengthened by that food, he walked forty days and forty nights to the mountain of God, Horeb."  (1 Kings 19: 7-8)

Elijah ate and drank and became strengthened by the food and was able to walk 40 days and 40 nights to Horeb.

The Christian life is a journey towards Heaven.  Elijah needed the food and drink provided by the angel to walk to Horeb.  So do Christians need the Eucharist in our walk to heaven.  The Eucharist is the Body and Blood of Jesus Christ given to strengthen our journey to Heaven.