On my fasting days, I would wake up, have coffee, and start my day without any food. This would continue until about 5:30 p.m., when I would prepare a dinner that didn’t vary from my regular dinner in terms of either what or how much I ate. So, my fasting dinner would be something normal for me, like stir-fry, pasta, soup, sandwich, sushi, etc. This dinner looked like any other and occurred at the usual time. This made it simpler — I was just resuming eating with no special fanfare.
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Physiologically, calorie restriction has been shown in animals to increase lifespan and improve tolerance to various metabolic stresses in the body.  Although the evidence for caloric restriction in animal studies is strong, there is less convincing evidence in human studies. Proponents of the diet believe that the stress of intermittent fasting causes an immune response that repairs cells and produces positive metabolic changes (reduction in triglycerides, LDL cholesterol, blood pressure, weight, fat mass, blood glucose). [3,5] An understandable concern of this diet is that followers will overeat on non-fasting days to compensate for calories lost during fasting. However, studies have not shown this to be true when compared with other weight loss methods. 
As a functional medicine practitioner, I see a wide range of health problems that all stem from chronic inflammation. And while acute inflammation is a natural and healthy response to help fight off pathogenic bacteria and infections, long-term chronic inflammation that doesn’t subside when the threat is gone can contribute to everything from autoimmune conditions to cancer.
As you pray and fast, you will call on God, and He will answer you. Answered prayer is the quintessence of praying and fasting. If I were to share with you the five or six pages of the prayer journal I prepared prior to my first forty-day fast, and then walk you back through my journal since then, you would see one thing: My prayers were answered. They are still being answered. There is something to the disciplines of prayer and fasting. I could point you to every experience of long-term fasting where God has answered my requests before Him. This does not mean they were answered as I preferred, but it did not matter. He had worked in my heart, and I was released, fully confident that God was ordering my way. When we humble ourselves before the Father, and when God sees we are serious about giving Him our broken spirits, He begins to do things we have never seen before. It’s empowering. It sensitizes us to the needs of others at home and overseas as we suddenly find ourselves quietly praying for people, events, and situations with the knowledge that our prayers not only will be heard but that the Father will answer them.
Worried about losing muscle if you fast? Maybe this will put your concerns to rest: a single 24-hour fast increased human growth hormone (HGH) by 2000% in men and 1300% in women. HGH plays an integral role in building muscle. Boosting your levels this high will have huge effect on your physique. Research shows that higher levels of HGH leads to lower levels of body fat, higher lean body mass and improved bone mass.
Fasting ramps up your stem cell production. Stem cells are like biological playdough — your body turns them into any kind of cell it needs and uses them to replace old or damaged cells, keeping you younger on a cellular level. Stem cells are great for your skin, joints, old injuries, chronic pain, and more. You can try stem cell therapy…or you can just fast.
Classical Pentecostalism does not have set days of abstinence and lent, but individuals in the movement may feel they are being directed by the Holy Spirit to undertake either short or extended fasts. Although Pentecostalism has not classified different types of fasting, certain writers within the movement have done so. Arthur Wallis writes about the "Normal Fast" in which pure water alone is consumed. The "Black Fast" in which nothing, not even water, is consumed is also mentioned. Dr. Curtis Ward points out that undertaking a black fast beyond three days may lead to dehydration, may irreparably damage the kidneys, and result in possible death. He further notes that nowhere in the New Testament is it recorded that anyone ever undertook a black fast beyond three days and that one should follow this biblical guideline. Dr. Herbert Shelton advises that one should drink water according to natural thirst. In addition to the Normal Fast and the Black Fast, some undertake what is referred to as the Daniel Fast (or Partial Fast) in which only one type of food (e.g., fruit or fruit and non-starchy vegetables) is consumed. In a Daniel Fast, meat is almost always avoided, in following the example of Daniel and his friends' refusal to eat the meat of Gentiles, which had been offered to idols and not slaughtered in a kosher manner. In some circles of Pentecostals, the term "fast" is simply used, and the decision to drink water is determined on an individual basis. In other circles profuse amounts of pure water is advised to be consumed during the fasting period to aid the cleansing of internal toxins. Most Pentecostal writers on fasting concur with Dr. Mark Mattson who says that sensible intermittent fasting with a sensible water intake can strengthen the organism and assist thwarting degenerative diseases.
As long as you are in a calorie deficit then meal timing is irrelevant. In some cases large late night meals have been shown to preserve muscle mass better on a diet and result in a greater loss in body fat percentage. I highly recommend reading Martin Berkhan’s article on the subject – Is Late Night Eating Better for Fat loss and Health. Check out this post for more on the differences between the Kinobody approach and LeanGains (Martin Berkhan’s approach).
Fasting from food is not necessarily for everyone. Some health conditions keep even the most devout from the traditional course. However, fasting is not limited to abstaining from food. As Martyn Lloyd-Jones said, “Fasting should really be made to include abstinence from anything which is legitimate in and of itself for the sake of some special spiritual purpose.”
Unger’s Bible Dictionary explains that the word fast in the Bible is from the Hebrew word sum, meaning “to cover” the mouth, or from the Greek word nesteuo , meaning “to abstain.” For spiritual purposes, it means to go without eating and drinking (Esther 4:16 Esther 4:16Go, gather together all the Jews that are present in Shushan, and fast you for me, and neither eat nor drink three days, night or day: I also and my maidens will fast likewise; and so will I go in to the king, which is not according to the law: and if I perish, I perish.
Repent through fasting. Empathize with God’s grief over your sins by fasting. Engage your entire person in repentance by using your body to turn away from self-indulgence and toward God. At church, schedule some times to fast with others for group repentance, just as you all sometimes gather to feast together in celebration (at church parties, potluck dinners, etc.). Express your personal repentance through fasting at times like during Lent and Holy Week, when God seems absent from your life, and when you realize your own complicity in society’s moral wrongs.
Martin Luther, founder of the Lutheran Churches, held that fasting served to "kill and subdue the pride and lust of the flesh". As such, the Lutheran churches often emphasized voluntary fasting over collective fasting, though certain liturgical seasons and holy days were times for communal fasting and abstinence. Certain Lutheran communities advocate fasting during designated times such as Lent, especially on Ash Wednesday and Good Friday. A Handbook for the Discipline of Lent delineates the following Lutheran fasting guidelines:
Time-restricted eating is pretty simple to implement. If you finish dinner at 7 p.m., for instance, you wouldn’t eat anything again until at least 7 a.m. If you wanted to take it further, you’d extend the no-eating time until about 11 a.m. or 12 p.m. Because you’re sleeping for a large chunk of the “no eating” time, this is a good way to introduce fasting into your lifestyle and experiment without any major changes.
The purpose in fasting for God is not about giving up food; it is about removing the obstacles that get in the way of fully focusing on Him. Human beings are conditioned to eat, usually 3 meals a day and snacks. We are so focused on what we are going to eat next, we leave very little room in our minds for thinking about God. Removing the food will free up your mind so you can meditate on God.
Saint Augustine's Prayer Book defines "Fasting, usually meaning not more than a light breakfast, one full meal, and one half meal, on the forty days of Lent." Abstinence, according to Saint Augustine's Prayer Book, "means to refrain from some particular type of food or drink. One traditional expression of abstinence is to avoid meat on Fridays in Lent or through the entire year, except in the seasons of Christmas and Easter. It is common to undertake some particular act of abstinence during the entire season of Lent. This self-discipline may be helpful at other times, as an act of solidarity with those who are in need or as a bodily expression of prayer."