A diagnostic fast refers to prolonged fasting from 8–72 hours (depending on age) conducted under observation to facilitate the investigation of a health complication, usually hypoglycemia. Many people may also fast as part of a medical procedure or a check-up, such as preceding a colonoscopy or surgery. Fasting may also be part of a religious ritual.

Lacy Enderson is an Addictions and Recovery Counselor. She is Certified with the American Association of Christian Therapists and holds a Master's Degree in Biblical Counseling. She is currently enrolled in Liberty University's Master of Divinity Degree program with Chaplaincy. Lacy is a graduate of Rhema Correspondent Bible School and has completed the first section of Berean School of the Bible. Lacy is the author of, "Addiction: A Personal Story" and "So You Want to Lose Weight But You Can't Stop Eating." Her newest novel is a teenage Christian fiction titled, "Honey Sweetheart."
When your empty stomach starts to growl and begins sending your brain every “feed me” signal it can, don’t be content to let your mind dwell on the fact that you haven’t eaten. If you make it through with an iron will that says no to your stomach, but doesn’t turn your mind’s eye elsewhere, it says more about your love for food than your love for God.
When I started intermittent fasting, I spent a lot of time thinking about how I wasn’t eating. I would think about how hungry I was, and then, when it came time to break my fast, I would eat more than a regular dinner, thinking I deserved it after having fasted all day. This is how people fail at intermittent fasting. It took me about two weeks to figure it out.
^ Bhikkhu, Thanissaro (5 June 2010). "Questions of Skill". Access to Insight. John T. Bullitt. Retrieved 7 June 2011. Each time you're about to act, ask yourself: "This action that I want to do: would it lead to self-harm, to the harm of others, or to both? Is it an unskillful action, with painful consequences, painful results?" If you foresee harm, don't follow through with it.
When we fast and pray, God teaches us how to share with those who have physical and spiritual needs. “Is it not to share your food with the hungry and to provide the poor wanderer with shelter—when you see the naked, to clothe him, and not to turn away from your own flesh and blood?” (Isa. 58:7 NIV). The book of Proverbs complements this passage by reminding us that when we give to the poor, we lend to the Lord. Fasting and prayer put the self-life into perspective. You are never more like God than when you give. Prayer and fasting can build within you the character to give. Giving is a joy, and we need to be willing to pour ourselves out to those who can do nothing for us in life. We need to be willing to pour out ourselves to anyone, anytime, anywhere. This is the heart of Jesus, and it needs to be our heart. Prayer and fasting build within you the power to give.
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.

In particular, consider fasting together with your family, small group, or church. Do you share together in some special need for God’s wisdom and guidance? Is there an unusual difficulty in the church, or society, for which you need God’s intervention? Do you want to keep the second coming of Christ in view? Plead with special earnestness for God’s help by linking arms with other believers to fast together.
Tisha B'Av and Yom Kippur are the major fasts and are observed from sunset to the following day's dusk. The remaining four fasts are considered minor and optional fasting is only observed from sunrise to dusk.[90] Both men and women can choose to observe them,[91] and a rabbi may give a dispensation if the fast represents too much of a hardship to a sick or weak person, or pregnant or nursing woman.
All three types offer the same fat-burning benefits of intermittent fasting. The real differences are just in how long you’re fasting and what you’re allowed to eat during the fast, Varady says. On both whole-day fasting and alternate-day fasting, for example, you consume 500 calories per fast day to spark fat loss but maintain muscle. During time-restricted feeding, however, you’re consuming zero calories during your fast period (water and tea, for example, are allowed). In all types, you’re free to go hog-wild during the feeding window—though, obviously, all nutritionists would recommend you ditch the junk and stick to healthy fare.

fast, rapid, swift, fleet, quick, speedy, hasty, expeditious mean moving, proceeding, or acting with celerity. fast and rapid are very close in meaning, but fast applies particularly to the thing that moves fast horses and rapid to the movement itself. rapid current swift suggests great rapidity coupled with ease of movement. returned the ball with one swift stroke fleet adds the implication of lightness and nimbleness. fleet runners quick suggests promptness and the taking of little time. a quick wit speedy implies quickness of successful accomplishment speedy delivery of mail and may also suggest unusual velocity. hasty suggests hurry and precipitousness and often connotes carelessness. a hasty inspection expeditious suggests efficiency together with rapidity of accomplishment. the expeditious handling of an order
Fasting during religious festivals is also very common. Common examples are Maha Shivaratri (Most people conduct a strict fast on Maha Shivratri, not even consuming a drop of water ), or the nine days of Navratri (which occurs twice a year in the months of April and October/November during Vijayadashami just before Diwali, as per the Hindu calendar). Karwa Chauth is a form of fasting practised in some parts of India where married women undertake a fast for the well-being, prosperity, and longevity of their husbands. The fast is broken after the wife views the moon through a sieve. In the fifth month (Shravan Maas) of the Hindu calendar, many celebrate Shraavana. During this time some will fast on the day of the week that is reserved for worship of their chosen god(s), while others will fast during the entire month.[82]
So wrong and inaccurate in so many levels I really don’t know where to start in trying to correct such an ignorant statement. I don’t know if you are being sarcastic in this post… 1st of all it is not ‘simple’ in any way to avoid bad foods-our primitive brain cries out for them and when we diet it cries out louder. That is the big reason dieting is soo hard to stick to, it’s putting the body and mind under very unnatural conditions.
It’s important to understand that fasting, as part of The Fast Diet, does not mean starving yourself. In The Fast Diet, you limit the amount and the kind of food you put into your body on a daily basis. So, if you are looking to fast throughout the day, don’t skip lunch — just eat fewer calories. If you normally eat a sandwich and chips for lunch, swap that out for a salad and an apple — this meal is significantly fewer calories and healthier for you too!

Bhagiratha says, The vow of fast was known to Indra. He kept it a secret but USANAS first made it known to the universe. Bhagiratha says, "In my opinion, there is no penance higher than fast." Bhagiratha did many sacrifices and gave gifts and says "the present that flowed from me were as copious as the stream of the Ganga herself.(but ..) it is not through the merits of these acts that I have attained this region." Bhagiratha observed the vow of fasting and reached "the region of Brahman"
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
Jesus’ statements concerning fasting are simple and straightforward. His disciples will fast (Luke 5:33-35 Luke 5:33-35 33 And they said to him, Why do the disciples of John fast often, and make prayers, and likewise the disciples of the Pharisees; but your eat and drink? 34 And he said to them, Can you make the children of the bridal chamber fast, while the bridegroom is with them? 35 But the days will come, when the bridegroom shall be taken away from them, and then shall they fast in those days.
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.

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.

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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