Although I do not fast like you do (from sunrise to sunset) I do continue to fast not just to maintain my weight but to free the mind and body or the extra weight and burdens that it must carry. You see when your stomach is not full and your mind is not sluggish from trying to digest a heavy meal you start to have more energy think clearer, sleep better and feel better. When you can have this in your life for free why not take it. Some people spend thousands to have access to these feelings when we can experience a little bit of this each week.
Physician Roy Walford was one of the scientists. He also happened to be a CR devotee and had recently written a book on living to the age of 120 by following the regimen. Soon after entering, the team realized the food they raised in the dome wouldn’t be enough to sustain them. So Walford implemented an impromptu CR experiment. The four men and four women reduced their approximate calorie intake by up to 30 percent. It was essentially the first human study of CR and its effects.

A fast for God doesn't have to be all day. It can be one meal. You could choose to give up sugar or caffeine. Fasting for God is sacrificing something that is important to you. Surrendering to God means giving of yourself for Him. We cry out, "All of you, none of me." Fasting tears down strongholds, fasting causes divine power to loose the chains of injustice and sets the captive free. A fast for God ushers in every ministering spirit to go forth on your behalf bringing solutions to every problem. If you want to see God's power working in your life, then fast.
6. Are you hungry all the time? A scale of 1 to 10 is helpful in moments like this. One is ravenous, while 10 is extremely full. What is your number before and after meals? What is your number at moments during the fast? While hunger may be part of a fast given the caloric restriction, it shouldn’t be constant, ongoing and terrible. Also, notice portions when eating. If you haven’t created the right balance, you might overeat when breaking a fast, which is hard on your digestion and metabolism. Ideally, once acclimated, you’d stay within the 3 to 7 range at all times, 3 when fasting and 7 after meals.
Vitousek, the psychologist, has seen this kind of enthusiasm before — and it was for CR. Caloric restriction never reached fasting’s popularity, but it had its share of lay followers in the 2000s, when she got a chance to talk with members of a group practicing it. Initially, they were excited and motivated. Then, like most dieters, the majority began to fall away. Some who had done CR for years simply couldn’t do it anymore. “You can pretty much take that to the bank,” Vitousek says of dieters’ waning enthusiasm. “That’s why we have these cyclical waves.”
This type of fasting is also known as cyclic fasting. Intermittent fasting is a catch-all phrase for eating (and not eating) intermittently. In fact, almost all of the fasting methods below are types of intermittent fasting! Typical intermittent fast times range from 14 to 18 hours. The longest period any one of these plans would require you to abstain from solid food would be about 32–36 hours.

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The drawbacks were clear. The men became obsessed with food to the exclusion of everything else in their life, and when the calorie restriction ended, they all over-reacted. Within a few weeks, they regained all of the lost weight plus about 10 percent more. Other studies have come to similar conclusions. So starvation-type diets may not be ideal for the average person. Your body will tend to shut down various processes in order to survive. For example, by reducing thyroid function, your body will not burn as many calories.
In a physiological context, fasting may refer to the metabolic status of a person who has not eaten overnight, or to the metabolic state achieved after complete digestion and absorption of a meal. Several metabolic adjustments occur during fasting. Some diagnostic tests are used to determine a fasting state. For example, a person is assumed to be fasting once 8–12 hours have elapsed since the last meal. Metabolic changes of the fasting state begin after absorption of a meal (typically 3–5 hours after eating).