Why would anyone volunteer to go hungry? Why would any of us want the pain, discomfort, headaches, and weakness that comes about when a person fasts? Good questions. Donald Whitney, in Spiritual Disciplines for the Christian Life, wrote that “fasting is the most feared and misunderstood of all the spiritual disciplines”.
Fasting is voluntarily going without food (and sometimes water) for a period of time - " it could be for just one meal, or for a day, or even several days. And when you look at all the examples in Scripture where people fasted, you will notice a pattern. In each case, they are desperate for God. They recognize their humble and helpless state and if God's power and presence doesn't come into their situation, then they will fail or be destroyed. Sometimes they need God to rescue them, sometimes to give them wisdom or direction, sometimes to show mercy to them, sometimes to resist or overcome the lies of Satan, or sometimes restoration, etc.
So what about us? Are we desperate for God or complacent?