A quick guide to fasting

Start with a partial fast or a daytime total or water-only fast until supper. When you can manage that without feeling faint or famished, you’re ready to step it up to three days, then five, then seven.
Don’t pig out as you approach a fast.
Stop caffeine a few days before a fast so you don’t have to deal with hunger and caffeine headaches at the same time.
Eat fresh fruit only on the day before a fast begins
Ask these questions of yourself: Am I confident that this desire to fast is God-given? Would He have me undertake a normal or just a partial fast? Are my motives right? Is there any hidden desire to impress others? What are my spiritual objectives in this fast? Do my objectives tend to be self-centered? Is my desire for personal blessing balanced by genuine concern for others? Am I determined above all else to minister to the Lord in this fast through worship?
Keep a journal about your physical and spiritual experiences.
Expect spiritual attacks before and during the fast. Use the spirit of praise as a counterattack.

Craving for food for a couple days or longer.
Weakness or faintness for a few days.
Growing strength with little or no concern about food.
Occasional spasms of weakness.
Feeling that you could continue the fast with no effort.
Hunger pangs show the body is done cleansing itself and is now drawing on sound living tissue. This may occur by the 21st day but often not until the 40th day, when starvation can set in.
Physical benefits: “brightness of eye, pure breath, clear skin and a sense of physical well-being.” Senses, especially taste and smell, are “sharpened and quickened,” mental powers “remarkably clear and active.”

Curb and control your appetite until your body is ready for a full feeding.
Break with fruit or vegetable juices, freshly squeezed, if possible. Drink a half glass, diluted, every two hours the first day.Increase the amount gradually. You’re then ready to take the fruit itself and milk or yogurt. Then fresh salads without dressing. Next, toast with some butter. Lastly, meat.
When first eating again, eat slowly, chew thoroughly, rest, stop when you first feel full.