Posted by a member of my ministry...
it's a good idea for believers to fast from time to time. Fasting is not required in Scripture, but it's highly recommended. The only Biblical reason to fast is to develop a closer walk with God. By taking our eyes off the things of this world, we can focus better on Christ. "When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show men they are fasting. I tell you the truth, they have received their reward in full. But when you fast, put oil on your head and wash your face, so that it will not be obvious to men that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you" (Matthew 6:16-18).
Christian Fasting - A Lifestyle of Servant Living
Christian fasting is more than denying ourselves food or something else of the flesh - it's a sacrificial lifestyle before God. In Isaiah 58, we learn what a "true fast" is. It's not just a one-time act of humility and denial before God, it's a lifestyle of servant ministry to others. As Isaiah tells us, fasting encourages humility, loosens the chains of injustice, unties the chords of the yoke, frees the oppressed, feeds the hungry, provides for the poor, and clothes the naked. This concept of fasting isn't a one day thing - it's a lifestyle of servant living for God and others.
"Then your light shall break forth like the morning, your healing shall spring forth speedily, and your righteousness shall go before you; the glory of the Lord shall be your rear guard. Then you shall call, and the Lord will answer; you shall cry, and He will say, 'Here I am' (Isaiah 58:8-9).