Making sure you’re hydrated in general is not only healthy, but can also help stave off hunger. Drinking water before a meal and during the day can help temporarily stave off hunger pangs by putting something in your stomach. Plus, water helps keep your body functioning properly throughout the day. When you’re fasting, remember to get plenty of fluids.
Some of the best evidence on the impact of fasting on bodyweight and fat comes from a December 2018 systematic review. The researchers looked at randomized controlled trials of intermittent fasting and found that the people who fasted lost about 4 to 8 percent of their original bodyweight, on average. So fasting worked, but, interestingly, it didn’t outperform regular, continuous calorie restriction (“eat less every day” dieting), and it didn’t lead to dramatic weight loss.
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.
In a sense, everyone fasts. When we are in bed asleep, we go without any food or drink. That is fasting. That is why the first meal of the day is called breakfast. However, when people speak of fasting, they usually mean a longer period of time of deliberately choosing not to eat and drink. It can be for a whole day, part of a day or more than a day.
A randomized controlled trial that followed 100 obese individuals for one year did not find intermittent fasting to be more effective than daily calorie restriction.  For the 6-month weight loss phase, subjects were either placed on an alternating day fast (alternating days of one meal of 25% of baseline calories versus 125% of baseline calories divided over three meals) or daily calorie restriction (75% of baseline calories divided over three meals) following the American Heart Association guidelines. After 6 months, calorie levels were increased by 25% in both groups with a goal of weight maintenance. Participant characteristics of the groups were similar; mostly women and generally healthy. The trial examined weight changes, compliance rates, and cardiovascular risk factors. Their findings when comparing the two groups:
Add fasting to your church’s calendar. Throughout each year, schedule some time for your church’s congregation to fast to respond to different purposes, such as commemorating the major events in Jesus’ life or dealing with serious issues facing the world (poverty, abuse, the environment, the economy, wars, etc.). Encourage people in your church to fast before they’re baptized, and join with others in your congregation to fast before celebrating Communion. Also, remember to fast together regularly for repentance whenever God leads you all to do so.
Never forget that the fruit of the tree of the knowledge of good and evil was the knowledge of good and evil. There was an element of good in that fruit, not just evil. The devil told Eve specifically that the fruit of the tree was "good for food, and that it was pleasant to the eyes" (Gen. 3:6). All Eve had to do was look to see that the fruit was pleasant. She made a bad assumption, however, that what was visually pleasant would also be "good for food." In that, the devil was very wrong!
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Remember, fasting is for one’s spiritual health, which involves abstaining from food and drink while spending a lot of extra time in prayer and Bible study (Exodus 34:28 Exodus 34:28And he was there with the LORD forty days and forty nights; he did neither eat bread, nor drink water. And he wrote on the tables the words of the covenant, the ten commandments.
When you fast, be sure your devotion is to God. It is not necessary to tell the whole world what you are doing. If your fast is for man's praise and not God's approval, then your fast is in vain. Matthew 6:16-17 says, "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."
American King James Version×), which was portrayed in type by the Azazel goat on Atonement (Leviticus 16:20-22 Leviticus 16:20-22 20 And when he has made an end of reconciling the holy place, and the tabernacle of the congregation, and the altar, he shall bring the live goat: 21 And Aaron shall lay both his hands on the head of the live goat, and confess over him all the iniquities of the children of Israel, and all their transgressions in all their sins, putting them on the head of the goat, and shall send him away by the hand of a fit man into the wilderness: 22 And the goat shall bear on him all their iniquities to a land not inhabited: and he shall let go the goat in the wilderness.
On its web site, the Academy of Nutrition and Dietetics says that although there is evidence that intermittent fasting diets may help prevent chronic disease, more research is needed. It doesn't recommend the diet because "it is not a realistic long-term solution.” The academy also notes that "any variation of fasting may make a person irritable, cause daytime sleepiness/sleeplessness at night, and can even lead to dehydration."
Distinguish between fasting and abstinence. Fasting means not eating food (and sometimes not drinking) for a period of time (usually not more than 12 hours) in order to respond to a moment so sacred that indulging in food or drink would profane it. While some people say that they’re fasting when giving up something besides all food – like watching TV, having sex, or eating a specific kind of food, such as chocolate – for a while, that’s really abstinence, not fasting. Fasting is a more complete expression of devotion to God that can free you to focus your attention better on God.
Fasting is often used as a tool to make a political statement, to protest, or to bring awareness to a cause. A hunger strike is a method of non-violent resistance in which participants fast as an act of political protest, or to provoke feelings of guilt, or to achieve a goal such as a policy change. A spiritual fast incorporates personal spiritual beliefs with the desire to express personal principles, sometimes in the context of a social injustice.