Deuteronomy 8

"So He humbled you, allowed you to hunger, and fed you with manna which you did not know nor did your fathers know, that He might make you know that man shall not live by bread alone; but man lives by every word that proceeds from the mouth of the Lord.  Your garments did not wear out on you, nor did your foot swell these forty years. " vv.3-4

Read chapter 8
God allows us to hunger?  Yes, so that we can see the need for food for without food we would eventually die.   So just as God wants us to hunger for Him, that we need Him for survival.  Jesus quoted verse three of of Deuteronomy when He was fighting the devil being tempted to turn rocks into bread because He was hungry, but said, "Man shall not live by bread alone; but by every word that proceeds from the mouth of God" (Matt. 4:4).  Today man can't go long without eat before he dies; Ghandi once fasted 21 days when he was 70 years old but average length a person could go without any food is 12-14 days.  This verse will become fully true in God's Kingdom that literally will die when they don't have God's Word flowing through them.  
An incredible miracle is noted here if you pay close attention: their clothes and shoes didn't wear out and feet never sore after 40 years of wandering in the desert!  How many, if any, shoes or clothes have lasted you 40 years?  And they weren't just living city life but desert wilderness environment that probably got a lot dirtier and rougher use than most of our typical day use.  I'm not scything they wore the same clothes for forty years but they probably didn't all have a full wardrobe of clothes and shoes to change from often.  God is showing how He preserved them healthily to enter the Promised Land. So "the way" that we may be on in our own lives may seem long and require constant need of renewal, God provides us garments of joy through His son Jesus that will carry us through stronger in the end.