Daily Chizuk #1190

The pasuk says the reason that Hashem gave the Jewish People mann in the desert was למען הודיעך כי לא על הלחם לבדו יחיה האדם כי על כל מוצא פי ה' יחיה האדם. Meaning, to teach us that man does not live on bread alone, but rather on everything that comes from the mouth of Hashem does man live. It seems to us that the body is able to function when a person eats bread because bread is a source of dietary fiber which helps keep the digestive system healthy and helps control blood sugar and cholesterol levels. However, Ibn Ezra explains, the pasuk is telling us man lives only because Hashem says he should have life. It is not the nutrients of the bread that give a person life, it is the word of Hashem. The mann did not have nutrients, it was more of a spiritual type of food that did not even get excreted. With the mann, Hashem showed us that He, not food, is the One who gives us life.
It is not bread that gives people life, it is only Hashem.