Fasting is primarily the act of willingly abstaining from some or all food, drink, or both, for a period of time. An absolute fast is normally defined as abstinence from all food and liquid for a defined period, usually a single day (24 hours), or several days. Other fasts may be only partially restrictive, limiting particular foods or substance. The fast may also be intermittent in nature Fasting practices may preclude sexual and other activities as well as food.
In a physiological context, fasting may refer to (1) the metabolic status of a person who has not eaten overnight, and (2) to the metabolic state achieved after complete digestion and absorption of a meal. Several metabolic adjustments occur during fasting, and some diagnostic tests are used to determine a fasting state. For example, a person is assumed to be fasting after 8–12 hours. Metabolic changes toward the fasting state begin after absorption of a meal (typically 3–5 hours after a meal); "post-absorptive state" is synonymous with this usage, in contrast to the "post-prandial" state of ongoing digestion.
A diagnostic fast refers to prolonged fasting (from 8–72 hours depending on age) conducted under observation for investigation of a problem, usually hypoglycemia. Finally, extended fasting has been recommended as therapy for various conditions by health professionals of most cultures, throughout history, from ancient to modern.
Glucose is the body's primary fuel source and is essential for the brain's functioning. When denied glucose for more than 4–8 hours, the body turns to the liver for glycogen, a storage form of glucose, to be used for fuel. A process called glycogenolysis converts glycogen into a usable form of fuel. At this point, the body also uses small amounts of protein to supplement this fuel. This fuel will last for up to 12 hours before the body needs to turn to glycogen stored in muscles, lasting for a few more days. If glucose is still denied at this point, muscle wasting is prevented by temporarily switching to fat as the fuel source, meaning fat is converted into ketone bodies through catabolism. Ketones, while not sugars, can be used by the brain as a fuel source as long as glucose is denied.
The body continues to use fat for as long as there is fat to consume. The body will generally indicate to the faster when fat levels are running extremely low (less than 7% and 10% of body weight for males and females, respectively) with an increased urge for food. Fasts are usually broken long before this point. If the fast is not broken, starvation begins to occur, as the body begins to use protein for fuel. Health complications associated with fast-induced starvation include electrolyte imbalances, thinning hair, lanugo, cardiac arrhythmia and renal failure.
Death can occur if fasting is pursued to the point of complete starvation.
Research suggests there are major health benefits to caloric restriction. Benefits include reduced risks of cancer, cardiovascular diseases, diabetes, insulin resistance, immune disorders, and more generally, the slowing of the aging process, and the potential to increase maximum life span.[3] According to Dr. Mark P. Mattson, chief of the laboratory of neurosciences at the US National Institute on Aging, fasting every other day (intermittent fasting) shows beneficial effects in mice as strong as those of caloric-restriction diets, and a small study conducted on humans at the University of Illinois indicates the same results According to the US National Academy of Sciences, other health benefits include stress resistance, increased insulin sensitivity, reduced morbidity, and increased life span. Long-term studies in humans have not been conducted.
However, short-term human trials showed benefits in weight loss. The side effect was that the participants felt cranky during the three week trial. According to the study conducted by Dr. Eric Ravussin, "Alternate-day fasting may be an alternative to prolonged diet restriction for increasing the life span".
Adherence to Greek Orthodox fasting periods contributes to an improvement in the blood lipid profile, including a decrease in total and LDL cholesterol, and a decrease in the LDL to HDL cholesterol ratio. A statistically insignificant reduction in HDL cholesterol was also observed. These results suggest a possible positive impact on the obesity levels of individuals who adhere to these fasting periods.[
Changes in blood chemistry during fasting, in combination with certain medications, may have dangerous effects, such as increased chance of acetaminophen poisoning. Excessive fasting for calorie restrictive purposes, accompanied by intense fears of becoming overweight are associated with mental disturbances, including anorexia nervosa.
Most Submitters (Muslims) do not fast because of medical benefits but because it has been ordained to them in the Quran. The medical benefits of fasting are as a result of fasting.
Fasting in general has been used in medicine for medical reasons including weight management, for rest of the digestive tract and for lowering lipids. There are many adverse effects of total fasting as well as so-called crash diets. Islamic fasting is different from such diet plans because in Ramadan fasting, there is no malnutrition or inadequate calorie intake. The caloric intake of Muslims during Ramadan is at or slightly below the national requirement guidelines. In addition, the fasting in Ramadan is voluntarily taken and is not a prescribed imposition from the physician.
Ramadan is a month of self-regulation and self-training, with the hope that this training will last beyond the end of Ramadan. If the lessons learned during Ramadan, whether in terms of dietary intake or righteousness, are carried on after Ramadan, it is beneficial for one’s entire life. Moreover, the type of food taken during Ramadan does not have any selective criteria of crash diets such as those which are protein only or fruit only type diets. Everything that is permissible is taken in moderate quantities.
The only difference between Ramadan and total fasting is the timing of the food; during Ramadan, we basically miss lunch and take an early breakfast and do not eat until dusk. Abstinence from water during this period is not bad at all and in fact, it causes concentration of all fluids within the body, producing slight dehydration. The body has its own water conservation mechanism; in fact, it has been shown that slight dehydration and water conservation, at least in plant life, improve their longevity.
The physiological effect of fasting includes lower of blood sugar, lowering of cholesterol and lowering of the systolic blood pressure. In fact, Ramadan fasting would be an ideal recommendation for treatment of mild to moderate, stable, non-insulin diabetes, obesity and essential hypertension. In 1994 the first International Congress on "Health and Ramadan," held in Casablanca, entered 50 research papers from all over the world, from Muslim and non-Muslim researchers who have done extensive studies on the medical ethics of fasting. While improvement in many medical conditions was noted; however, in no way did fasting worsen any patients’ health or baseline medical condition. On the other hand, patients who are suffering from severe diseases, whether diabetes or coronary artery disease, kidney stones, etc., are exempt from fasting and should not try to fast.
There are psychological effects of fasting as well. There is a peace and tranquility for those who fast during the month of Ramadan. Personal hostility is at a minimum, and the crime rate decreases. ... This psychological improvement could be related to better stabilization of blood glucose during fasting as hypoglycemia after eating, aggravates behavior changes. ... Similarly, recitation of the Quran not only produces a tranquility of heart and mind, but improves the memory.
[2:185] Ramadan is the month during which the Quran was revealed, providing guidance for the people, clear teachings, and the statute book. Those of you who witness this month shall fast therein. Those who are ill or traveling may substitute the same number of other days. GOD wishes for you convenience, not hardship, that you may fulfill your obligations, and to glorify GOD for guiding you, and to express your appreciation.
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