Whether a regimen calls for two fasting days a week or eating your meals in a smaller "window" of time in the day, all plans share a near-freedom from calorie counting, a big plus for weary food diarists. Once you have planned your fasting-period menu—say, a 500-calorie day of chicken and veggies—you're set. And in your nonfasting periods, you eat normal, healthy meals (even that steak!) without worrying about every bite.
In addition to its role in religion, fasting may be used to express social and political views, particularly as a gesture of protest or solidarity. The classic example of this approach was set by Mahatma Gandhi, who in the early 20th century conducted a fast in prison to atone for the violent excesses of those of his followers who did not practice his teaching of satyagraha (nonviolence) against British rule in India. Gandhi later often fasted in pursuit of similar objectives, including the removal of disabilities imposed by the government on the untouchables. Fasting has frequently been practiced to protest against war and what are considered social evils and injustices, as in the fasts of the American black comedian Dick Gregory from the 1960s in protest against the violation of civil rights of American Indians and against U.S. military activity in Southeast Asia. In 1981, 10 Irish nationalists died in a Belfast prison during a hunger strike conducted to urge recognition of themselves and their associates as political prisoners.
If you’re eating processed foods and potato chips, it’s unlikely you’ll reap the benefits of fasting. If that’s you, I encourage you to examine your diet before trying a fast. But if you practice fasting and stick to a mostly whole food diet, rich in fruits, veggies, lean proteins, healthy fats and raw dairy, you will see changes — and those occasional splurges on chocolate or cheese won’t have as big of an impact as they might if you were on a calorie-restrictive diet.
Even though you are skipping breakfast, it's still important to stay hydrated. Make sure to still drink enough water. You can also have herbal tea. The catechins in tea have been shown to enhance the benefits of fasting by helping to further decrease the hunger hormone ghrelin, so you can make it until lunch and not feel deprived. Since you’ve increased your fasting period an extra four hours, you need to make sure your first meal (at noon) has enough healthy fats. The burger in the 8-to-6 window plan will work well, and you can add more fats in with your dressing or top with an avocado!

A 2018 review of intermittent fasting in obese people showed that reducing calorie intake one to six days per week over at least 12 weeks was effective for reducing body weight on an average of 7 kilograms (15 lb); the results were not different from a simple calorie restricted diet, and the clinical trials reviewed were run mostly on middle-aged women from the US and the UK, limiting interpretation of the results.[21] Intermittent fasting has not been studied in children, the elderly, or underweight people, and could be harmful in these populations.[21][22]
IF might sound wacky to some, but there’s evidence that intermittent fasting for weight loss does work. One 2016 study in the Journal of Translational Medicine found that people who practiced IF for eight weeks lost more body fat than those in the control group. Another 2012 study from the Nutrition Journal suggests that IF can help obese women lose weight as well as lower their heart disease risk.

According to a research published in Cell Metabolism, fasting for 12+ hours most days may promote weight loss, prevent disease and promote longevity. The researchers, who divided the mice into four diet groups and categorised them into different feeding schedules, found that mice fasted for at least 12 hours and kept their eating within a set 12-hour time frame experienced significant weight loss compared to mice eating the same diet but with liberty to eat all day long. 

Fasting has been used in Europe as a medical treatment for years. Many spas and treatment centers, particularly those in Germany, Sweden, and Russia, use medically supervised fasting. Fasting has gained popularity in American alternative medicine over the past several decades, and many doctors feel it is beneficial. Fasting is a central therapy in detoxification, a healing method founded on the principle that the build up of toxic substances in the body is responsible for many illnesses and conditions.

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.
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