Yes, it's a good idea for believers to fast from time to time. Fasting is not required in Scripture, but it's highly recommended. The primary Biblical reason to fast is to develop a closer walk with God. By taking our eyes off the things of this world, we can focus better on Christ. "When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show men they are fasting. I tell you the truth, they have received their reward in full. But when you fast, put oil on your head and wash your face, so that it will not be obvious to men that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you" (Matthew 6:16-18).

        Fasting is to be done with the object of seeking to know God in a deeper experience (Isaiah 58:1; Zechariah 7:5). Fasting relates to a time of confession (Psalms 69:10). Fasting can be a time of seeking a deeper prayer experience and drawing near to God in prevailing prayer (Ezra 8:23; Joel 2:12). The early church often fasted in seeking God's will for leadership in the local church (Acts 13:2). When the early church wanted to know the mind of God, there was a time of prayer and fasting.


Additionally, alternate-day fasting and whole-day fasting have been shown to not only reduce body fat but also total cholesterol and triglycerides in both overweight and normal-weight people, according to a study analysis in Nutrition Reviews. Because intermittent fasting can stabilize insulin levels—if you don’t eat, your blood sugar will come down—there’s reason to believe it could be a good diet for people with Type 2 diabetes, Varady adds. Research also suggests that intermittent fasting may even help prevent Alzheimer’s and cancer, adds Fung.
Peipert was 48, stood at 5 feet, 5 inches, and weighed 174 pounds. During the trial, he cut his daily food intake from 3,300 to 2,475 calories, and his weight dropped to 147 pounds. His health biomarkers, especially his blood pressure, were excellent. “It was a remarkable drop in blood pressure. That taught me that, for our health, if we were just a little thinner, we’d be better off,” says Peipert, a gynecologist and researcher at the Indiana University School of Medicine.
On first fast days, people often expect to feel really hungry. But thought you will be aware of eating less, you’ll probably be surprised at how quickly any pangs pass, especially if you keep busy with work or other activities. On the first few fasts, some people report feeling the cold more, or experiencing headaches – both of these are common with all diets. Most people find it gets much easier after the first one of two fasts.
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When you’re intermittent fasting, you eat all the food your body needs but during a shorter period of time. There are many methods, but the most common involves eating during a 6- to 8-hour window, and fasting the remaining 14 to 16 hours. It’s not as bad as it sounds, especially when you add Bulletproof Coffee to keep hunger levels in check (more on that later).
This handy reference guide, Seven Basic Steps to Successful Fasting and Prayer, will help make your time with the Lord more spiritually rewarding. I encourage you to keep it with you during your fast and refer to it often because it gives easy-to-follow suggestions on how to begin your fast, what to do while you fast, and how to end your fast properly.
Wicked kings, destined for destruction, received mercy from humbling themselves and fasting (1 Kings 21:29). The entire city of Nineveh, including animals, fasted upon hearing the pronouncement of judgment from the prophet Jonah -- and God spared them (Jonah 3:10). Jesus received divine preparation for His earthly ministry while fasting and enduring temptation. Moses waited upon God forty days and received the divine revelation of God’s commandments.
It may sound really hard at first, but at least eight hours of the 16 is spent sleeping. There's also a lot of downtime between dinner and sleeping that adds up. Just be patient with yourself, and you'll find your body adjusting to this new eating schedule in no time. If you're looking to get started now, what better way than planning what you're going to eat during your eight-hour eating window?
         Refraining from eating food. The Bible describes three main forms of fasting: 1) The Normal Fast, involving the total abstinence of food. Luke 4:2 reveals that Jesus "did eat nothing." Afterwards "He was hungered." Jesus abstained from food but not from water. 2) In Acts 9:9 we read of an Absolute Fast where for three days He "neither did eat nor drink." The abstinence from both food and water seems to have lasted no more than three days (Ezra 10:6; Esther 4:16). 3) The Partial Fast-in Daniel 10:3 the emphasis is upon the restriction of diet rather than complete abstinence. The context implies that there were physical benefits resulting from this partial fast. However, this verse indicates that there was a revelation given to Daniel as a result of this time of fasting.
The digestive tract is the part of the body most exposed to environmental threats, including bacteria, viruses, parasites, and toxins. It requires the most immune system support. When food is broken down in the intestines, it travels through the blood to the liver, the largest organ of the body's natural detoxification system. The liver breaks down and removes the toxic by-products produced by digestion, including natural ones and the chemicals now present in the food supply. During fasting, the liver and immune system are essentially freed to detoxify and heal other parts of the body.
But it wasn’t until the 1940s that the first experiments began as an outgrowth of CR studies. Researchers started withholding food from lab animals on alternate days, says Michelle Harvie, a research dietitian in Manchester, England. And in 1946, The Journal of Nutrition published the first study on fasting, showing that rats deprived of food every third day lived longer and were less likely to develop tumors than control animals. Later work showed that fasting spurs metabolic changes similar to those of CR.
In 2012, Carolyn Corbin, who lives in the Channel Islands, got some firsthand experience with fasting’s flexibility. At 5 feet, 2 inches tall and 159 pounds, Corbin was overweight, with a BMI of 29.1. After seeing Mosley’s BBC show, she took up the 5:2 regimen, eating 500 calories two days a week and eating normally the rest of the time. She soon switched to water-only fasts two days a week. Since taking up the practice, the 65-year-old has lost 35 pounds and kept it off. “Forget calorie counting, diet food and diet drinks,” Corbin says. “Fasting for weight loss works.”
If you keep fast, to count everyday pledge yourself you will act honest, sincere, controls your desires, mediate. This is a way how you make yourself free of five thieves: "On the ninth day(naomi) of the month, make a vow to speak the Truth, and your sexual desire, anger and desire shall be eaten up. On the tenth day, regulate your ten doors; on the eleventh day, know that the Lord is One. On the twelfth day, the five thieves are subdued, and then, O Nanak, the mind is pleased and appeased. Observe such a fast as this, O Pandit, O religious scholar; of what use are all the other teachings? ||2||" (Guru Granth Sahib Ji, Ang 1245)
As fasting has grown in popularity, scientists and nutritionists have developed different methods of the practice. Some, such as Allen, practice time-restricted feeding, like the 20:4 regimen. Some push the approach to 23:1, cramming all their eating into one hour of a 24-hour day. Other approaches space out fasting days throughout the week, such as the 5:2 method — two days of fasting over seven days. Some enthusiasts supplement their practice with dayslong fasts.
The Bible also gives instructions about the attitude and approach we should have in fasting. Jesus warned about hypocritical fasting, trying to show off or make others feel sorry for us (Matthew 6:16-17). Instead we should not “appear to men to be fasting, but to your Father who is in the secret place” (verse 18). Isaiah also contrasts selfish fasting with godly fasting marked by care and concern for others (Isaiah 58:3-10).
Kickstarts ketosis: Usually, reaching full ketosis takes careful planning and extreme carb limiting, but intermittent fasting provides a shortcut to this fat-burning state. Once your body drains glucose — its primary source of energy —  it is forced to burn through its fat reserves for energy in a process called ketosis. Ketosis improves your blood chemistry, reduces inflammation, and helps you drop weight fast.[6] To really burn through extra fat, combine your intermittent fasting with a keto diet. Learn more here about why keto is more effective with intermittent fasting
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 ancient Greek physician Hippocrates wrote, “To eat when you are sick, is to feed your illness”. Another ancient Greek writer and historian Plutarch is also credited with penning “Instead of using medicine, better fast today”. In more recent times one of our founding fathers, Benjamin Franklin, stated, “The best of all medicines is resting and fasting”.
Fasting isn’t merely an act of self-deprivation, but a spiritual discipline for seeking more of God’s fullness. Which means we should have a plan for what positive pursuit to undertake in the time it normally takes to eat. We spend a good portion of our day with food in front of us. One significant part of fasting is the time it creates for prayer and meditation on God’s word or some act of love for others.
The problem is that too many people jump on the fasting bandwagon without understanding how to assess its impact. Once a plan has been integrated into your everyday life, you should take time every week or month to analyze how things are going. Even if weight loss is your primary goal, it’s important to consider how fasting is affecting other aspects of your health, such as your energy levels, ability to exercise and digestion. Here are some questions you should ask yourself.
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).
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