Jesus said, "Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise him on the last day. For my flesh is true food, and my blood is true drink. Whoever eats my flesh and drinks my blood remains in me and I in him. (Jn 6:51-58)
https://bible.usccb.org/bible/readings/081824.cfm
Food is essential to physical life. Food is essential to our spiritual life. The food that Christ gives is the gift of himself, the Eucharist, the Sacrament of his Body and Blood.