From "Greater Health God's Way" by Stormie Omartian
There are many reasons to fast. What's yours? Why would anyone attempt such a feat? Take a look at the list below to see why an individual might decide to fast.
To receive divine guidance, revelation or an answer to a specific problem
To hear God better and to understand more fully His will for your life
To weaken the power of the adversary (Compare fasting to getting a "holy oiling": Because of it, the world, the flesh and the devil can't hold on to you; you slip right through their clutches into freedom.)
To cope with present monumental difficulties
To have freedom from bondage
To establish a position of spiritual strength and dominion
To be released from heavy burdens (yours or others')
To break through a depression
To invite the Lord to create in you a clean heart and renew a right spirit
To seek God's face and have a closer walk with Him
To seek the Lord when He is directing you to do something you don't think you can do
To be free of evil or debilitating thoughts
To resist temptation
To be set free from everyday sins — pride, jealously, resentment, gluttony, gossiping, etc.
To help you when you are feeling confused
To help you when life seems out of control
To humble yourself
To break the lusting of the flesh
To gain strength
To invite God's power to flow through you more mightily