Promote human growth hormone production (HGH). Fasting can raise HGH by as much as 1,300 percent in women and 2,000 percent in men.12 HGH plays an important part in health, fitness, and slowing the aging process. It's also a fat-burning hormone Lower triglyceride levels and improve other biomarkers of disease Boost production of brain-derived neurotrophic factor (BDNF), stimulating the release of new brain cells and triggering brain chemicals that protect against changes associated with Alzheimer's and Parkinson's disease. (Alternate-day fasting — restricting your meals on fasting days to about 600 calories — can boost BDNF by 50 to 400 percent, depending on the region of the brain.13
The Bible gives examples of God’s people occasionally combining fasting with their prayers so as to stir up their zeal and renew their dedication and commitment to Him. King David wrote that he “humbled [him]self with fasting” (Psalms 35:13 Psalms 35:13But as for me, when they were sick, my clothing was sackcloth: I humbled my soul with fasting; and my prayer returned into my own bosom.
Embrace a healthy body image. Reject the dualistic way of thinking about people’s bodies that’s so popular in our culture. Your body and spirit aren’t two separate entities; they’re united as one whole. When you understand the profound connections between your body and spirit, it will become natural for you to respond to spiritual experiences by doing something physical like fasting.
It doesn't matter when you start your 8–hour eating period. You can start at 8am and stop at 4pm. Or you start at 2pm and stop at 10pm. Do whatever works for you. I tend to find that eating around 1pm and 8pm works well because those times allow me to eat lunch and dinner with friends and family. Breakfast is typically a meal that I eat on my own, so skipping it isn't a big deal.
One reason experts tell people not to cut way back on calories is that it can slow your metabolism, making it even harder to lose weight. But studies show that fasting from time to time can be an effective strategy for weight loss. In addition, cutting calories on a couple of days instead of every day may help preserve muscle, so you lose mostly fat.
The trial, which aimed to investigate how food deprivation affects the aging process, involved 218 normal and slightly overweight men and women between the ages of 21 and 51. Of the group, 143 of them were tasked with following CR, eating 25 percent fewer calories than usual — a decrease deemed feasible based on animal studies. They were to keep this regimen for two years with help from a behavioral intervention team and dietitians to make sure they were getting basic nutrition.
A man once said to me about fasting, "It seems that when I fast the world seems much more black and white, at least for a period of time. I see right and wrong much more clearly. I see good and bad, blessings and cursings, benefits and negative consequences, what is godly and what is ungodly. I am much more discerning about what lines up with God's commandments and what falls into the category of 'man's commands.'"
For Roman Catholics, fasting, taken as a technical term, is the reduction of one's intake of food to one full meal (which may not contain meat on Ash Wednesday and Fridays throughout Lent) and two small meals (known liturgically as collations, taken in the morning and the evening), both of which together should not equal the large meal. Eating solid food between meals is not permitted. Fasting is required of the faithful between the ages of 18 and 59 on specified days. Complete abstinence of meat for the day is required of those 14 and older. Partial abstinence prescribes that meat be taken only once during the course of the day. Meat is understood not to include fish or cold-blooded animals.
That means there’s certainly a type of person who won’t fare as well on it. “If you’re the type of person who wakes up ravenous, who loves breakfast, or who loves to snack, this may not be a good diet for you,” says Tinsley. “You won’t want to do something that makes it hard for you to adhere to. If this doesn’t gel with something you enjoy, you don’t need to fit yourself into this box just because intermittent fasting is popular right now.”
I sometimes hear people say, "I'm giving up chocolate" and they regard this as a type of fasting. I think this is a rather frivolous approach. The first and foremost purpose of a biblical or spiritual fast is to get a breakthrough on a particular matter that one lifts up to the Lord in prayer. A spiritual fast involves our hearts and the way in which we relate to and trust God. It relates to discerning and receiving strength to follow through on what God might reveal to us about circumstances in our lives or a direction we are to take.

^ Pfatteicher, Philip H. (1990). Commentary on the Lutheran Book of Worship: Lutheran Liturgy in Its Ecumenical Context. Augsburg Fortress Publishers. pp. 223–244, 260. ISBN 9780800603922. The Good Friday fast became the principal fast in the calendar, and even after the Reformation in Germany many Lutherans who observed no other fast scrupulously kept Good Friday with strict fasting.
Of course, fasting — regardless of the method — isn’t for everyone. If you have any medical conditions or special dietary requirements, it’s smart to consult a doctor before giving intermittent fasting a shot. Anyone who tries it should also plan to be highly self-aware while fasting. If it’s not agreeing with you, or if you need to eat a little something to hold you over, that’s just fine. It takes our bodies time to adjust, and some require more than others. Keep in mind that hormones can make it harder for women to follow a fasting plan than for men. “Be cautious at first, and start slowly [with a shorter fast],” Shanks recommends. If it doesn’t make you feel better, try something different, or accept the fact that maybe fasting isn’t for you.
The four-hour eating window — which Hofmekler refers to as the “overeating” phase — is at night in order to maximize the Parasympathetic Nervous System’s ability to help the body recuperate, promoting calm, relaxation and digestion, while also allowing the body to use the nutrients consumed for repair and growth. Eating at night may also help the body produce hormones and burn fat during the day, according to Hofmekler. During these four hours, the order in which you eat specific food groups matters, too. Hofmelker says to start with veggies, protein and fat. After finishing those groups, only if you are still hungry should you tack on some carbohydrates.
Autophagy is spring cleaning for your cells. It’s Latin for “self-eating,” which is spot-on: when autophagy turns on, your cells sift through their internal parts, get rid of anything that’s damaged or old, and install shiny new versions.[8] Autophagy is like a tune-up for your car: afterward everything runs more smoothly. It reduces inflammation and even boosts longevity. Intermittent fasting triggers, to quote researchers, “profound” autophagy, especially in your brain.[9]
When you don’t eat any food for a set period of time each day, you do your body and your brain a whole lot of good. It makes sense from an evolutionary standpoint. For most of history, people weren’t eating three square meals a day, plus grazing on snacks. Instead, humans evolved in situations where there wasn’t much food, and they learned to thrive when fasting.[1] Nowadays, we don’t have to hunt for food (although hunting for your own meat isn’t a bad idea!). Rather, we spend most of our days in front of computers, and we eat whenever we want — even though our bodies aren’t adapted to this behavior.

The Bible has only one command regarding fasting: God’s people are commanded to fast on the Day of Atonement from sundown to sundown (Leviticus 23:27-32 Leviticus 23:27-32 27 Also on the tenth day of this seventh month there shall be a day of atonement: it shall be an holy convocation to you; and you shall afflict your souls, and offer an offering made by fire to the LORD. 28 And you shall do no work in that same day: for it is a day of atonement, to make an atonement for you before the LORD your God. 29 For whatever soul it be that shall not be afflicted in that same day, he shall be cut off from among his people. 30 And whatever soul it be that does any work in that same day, the same soul will I destroy from among his people. 31 You shall do no manner of work: it shall be a statute for ever throughout your generations in all your dwellings. 32 It shall be to you a sabbath of rest, and you shall afflict your souls: in the ninth day of the month at even, from even to even, shall you celebrate your sabbath.
If we are to learn the lost art of fasting and enjoy its fruit, it will not come with our ear to the ground of society, but with Bibles open. Then, the concern will not be whether we fast, but when. Jesus assumes his followers will fast, and even promises it will happen. He doesn’t say “if,” but “when you fast” (Matthew 6:16). And he doesn’t say his followers might fast, but “they will” (Matthew 9:15).
In a paper published in 2002 on the pseudo-experiment, Walford and colleagues reported that the Biosphere staff had been in excellent health. Nearly all of them lowered their blood pressure, blood sugar, cholesterol and other health measures. Still, their skeletal appearance was shocking. “They were malnourished, and they didn’t look healthy,” says Eric Ravussin, a metabolic researcher at the Pennington Biomedical Research Center in Baton Rouge, Louisiana.
Another plus is that this is easily the most sustainable eating plan I’ve ever come across. You don’t need to fast forever to maintain the benefits — you can fast for a time and stop when you reach your goal weight. But if your weight creeps up, you can add in one fasting day per week to head it off, rather than going into full-blown “emergency calorie-restriction” mode.
I've been doing this fast with Jentezen Franklin for many years. I have seen miracles done, he healed me from addiction to alcohol! I know these fasts are hard, the spirit is willing, but the body is weak! I've fallen on past fasts, but asked God to forgive me, and went on. It's a physical struggle, but oh so worth it in the end! Please don't give up. 21 days is nothing compared to what's waiting for you at the end, and during the year! I've done the water only fasts, as well as the Daniel fast, which I'm doing now, that in itself is a struggle for me, as I don't care for fruits and vegetables much. God is his mercy and Grace see's each of our hearts, and knows we yearn for his closeness, but also he knows we are weak. Please keep praying and seeking, you won't be disappointed.

4) A sensitivity to God’s voice. The New Testament prophetess Anna is praised in the book of Luke for being a devoted servant to God and His temple. Because she regularly fasted and prayed, she was able to hear the voice of God speak clearly to her the day that Baby Jesus was brought into her temple to be dedicated. She knew He was the Christ and told everyone who would listen about His arrival. When we detox the spirit and become consumed with desire and praise for God, we become sensitive to His voice. Like Anna, when God speaks to us in the midst of chaos, we’ll still be able to pick out His voice and know what He wants us to do because we have trained our ear to hear Him through fasting, prayer, study and praise.

A study published in the July 2013 issue of Physiology & Behavior doesn't discuss intermittent-day fasting, but it addresses the concern of overeating after fasting. Researchers at Cornell University either fed breakfast to or withheld breakfast from a group of student volunteers. They found that those who skipped breakfast reported being hungrier than those who ate breakfast. They also ate more at lunch. Still, the amount they ate didn't fully compensate for the missed meal. Volunteers who skipped breakfast consumed 408 fewer calories over the course of the day than those who ate breakfast.
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.
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.
DU: There are different kinds of fasting. Scientifically speaking, ‘fasting’ can be caloric restriction, intermittent fasting, or dietary restriction. Caloric restriction is simply cutting down your energy intake by 20 to 40 percent. Intermittent fasting involves forgoing food completely for a period of time, say morning till evening, and then eating normal meals the next day or so. Dietary restriction is limiting or eliminating a particular macronutrient from one’s meal, say proteins or carbohydrates, for a season.
Pope Pius XII had initially relaxed some of the regulations concerning fasting in 1956. In 1966, Pope Paul VI in his apostolic constitution Paenitemini, changed the strictly regulated Roman Catholic fasting requirements. He recommended that fasting be appropriate to the local economic situation, and that all Catholics voluntarily fast and abstain. In the United States, there are only two obligatory days of fast – Ash Wednesday and Good Friday. The Fridays of Lent are days of abstinence: eating meat is not allowed. Pastoral teachings since 1966 have urged voluntary fasting during Lent and voluntary abstinence on the other Fridays of the year. The regulations concerning such activities do not apply when the ability to work or the health of a person would be negatively affected.
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