There is a point here that modern Americans miss. In that day and in much of the world today, most people could not afford meat. When we hear that “bread is the staff of life” it is not only saying that bread has a lot of nutritional value but it also is affordable. Most cultures seem to have some kind of product made from grain. The only food that produces more per acre would be potatoes and they don’t store for years.
When Jesus said,
(John 6:48 KJV) I am that bread of life.He was reminding us that He is to be the main staple of our existence.
So there is a sense here that we are being reminded to make sure that we don’t waste our time and energy on luxury and image. There is a reason simplicity goes with following Jesus.