I love the Little House on the Prairie book series. Little Woman and I just finished reading the series together as her bedtime story over the last couple of months. During The Long Winter, the Ingalls family survived off Almanzo's "seed" wheat when the trains were snowed in and they couldn't receive any supplies in their new town. Everyday they would take turns at the coffee grinder so Ma could make course bread with the ground wheat. They lived solely on bread until the snow melted enough to get the train supply of food in.
Elijah the prophet was kept alive on bread that the ravens brought him each morning during the famine the Lord had sent to humble the people. He also was given bread by the widow who had made her last cake for herself and son before assumedly dying. Because she fed the prophet first, her barrel of meal and cruse of oil were kept filled through the famine. (1 Kings 17)
The Lord fed Moses and the Israelites with manna, which was a type of bread prepared by the Lord for their survival. (Exodus 16)
Christ prayed over the bread and fish and both were multiplied to feed the people who came to hear him teach. (Matthew 15)
Christ calls himself the Bread of Life, reminding us that just as we need bread to survive physically, we need our Savior to survive spiritually. (John 6:35)
In my faith we have a code of health in what we call the Word of Wisdom, it is found in Doctrine and Covenants 89 and states:
"All grain is ordained for the use of man and of beasts, to be the staff of life...all grain is good for the food of man"