Fasting

Fasting is when people do not eat for a time. Some people do this for their faith. It can be part of a religious rule.

Doctors may ask people to fast too. They do this before a check-up. It helps them learn about a person's health.

Some people fast to show what they believe. This can be a way to protest. It can help people speak for a cause.

Fasting can also help people feel better. It may help a person's mood. It can even help them feel more alert.

People fast for many different reasons.

Fasting is when people do not eat for a time.

Many people fast for their religion. Muslims fast during the month of Ramadan. They do not eat or drink from dawn until sunset. In Judaism, people fast on Yom Kippur. This fast lasts 25 hours. Some Christians fast during Lent. Members of the Church of Jesus Christ of Latter-day Saints skip two meals once a month. They give the money they would have spent to help others.

Doctors use fasting for health checks. A doctor may ask you to fast before surgery. This keeps you safe while you are asleep. Fasting also helps with certain blood tests. It helps doctors find a baseline for your health.

Fasting can be a way to protest. This is often called a hunger strike. People do this to show they want change. Mahatma Gandhi used fasts to protest. César Chávez used spiritual fasts to promote nonviolence. Some people fast to show they care about a cause. It is a way to speak without using words.

Fasting is the act of not eating for a period of time. Sometimes, people also choose not to drink any liquids. This can happen for many different reasons in our world. Some people fast to help their bodies or for medical tests. Others fast because of their religious beliefs or to show a protest. It is a way to change how the body works.

When a person fasts, their body goes through many changes. After eating a meal, the body spends about three to five hours absorbing it. Once the food is gone, the body enters a fasting state. In early fasting, the body uses a process called gluconeogenesis to make energy. Eventually, the body switches to ketosis to find new energy. This means ketones replace glucose as the main fuel for the brain. During long fasts, the body may also lose important minerals like sodium and potassium.

People have used fasting throughout history for many important goals. In 1968, the leader César Chávez used a 25-day fast to promote nonviolence. He saw these spiritual fasts as a way to change himself. In 1981, a man named Bobby Sands took part in a hunger strike in Northern Ireland. He was protesting for better rights for prisoners. This strike was very serious and lasted for many days. These historical examples show how fasting can be used to make a powerful statement.

Many religions have specific rules for when and how to fast. In Islam, Muslims fast during the month of Ramadan from dawn until sunset. In Judaism, Yom Kippur is a 25-hour fast that includes no food or liquid. Christians often fast during the season of Lent. In the Catholic Church, people may also fast on Ash Wednesday and Good Friday. Members of the Church of Jesus Christ of Latter-day Saints skip two meals every month. They give the money they saved to help people in need.

Fasting is also a tool used by doctors in hospitals. A doctor might ask a patient to fast before a surgery. This is done to prevent a person from vomiting while they are under anesthesia. Fasting is also used before medical tests, like checking cholesterol levels. This helps doctors get a clear baseline for a person's health. While some people use fasting for weight loss, it must be done carefully. Doctors watch for things like refeeding syndrome, which can happen if someone eats too much too quickly after a long fast.

Fasting is the act of refraining from eating and sometimes drinking. From a physiological perspective, it refers to a specific metabolic state. This state occurs after the body has completely digested and absorbed a meal. Metabolic changes typically begin about three to five hours after eating. Fasting can serve many purposes, ranging from medical necessity to religious devotion. It is also used as a tool for political protest or personal health management.

When a person fasts, the body undergoes complex internal shifts. In the early stages, the body relies on a process called gluconeogenesis. This process creates glucose to provide necessary energy. As fasting continues, the metabolism eventually switches into a state known as ketosis. In ketosis, the body uses ketones as the primary energy source for the central nervous system instead of glucose. During prolonged fasting, which can last between five and twenty days, the body may experience drastic decreases in minerals. These include sodium, potassium, and magnesium, which can lead to a condition called hyponatremia. To prevent this, some people use non-caloric electrolyte supplements.

There are several distinct ways that people practice fasting. Intermittent fasting involves incorporating regular fasting periods into a dietary schedule, often for weight loss. Alternate-day fasting is a specific type where a person alternates between a 24-hour fast day and a 24-hour feast day. On a fast day, the person consumes less than 25% of their usual energy needs. Another type is the diagnostic fast, which is a prolonged period of fasting conducted under medical observation. These are often used to investigate health complications like hypoglycemia. Finally, there is the hunger strike, which is a form of non-violent resistance used to achieve political goals.

Historically, fasting has been used by many influential leaders to drive social change. The political leader Gandhi used long fasts as protests in India. In 1968, the American civil rights activist César Chávez undertook a 25-day spiritual fast. He used this period to promote the principle of nonviolence and to prepare for civil disobedience. In 1981, Bobby Sands participated in an Irish hunger strike to protest for prisoner rights. Sands died after 66 days without food, and the strike eventually involved ten men who died. These events show how fasting can be a powerful tool for public demonstration.

Medical professionals use fasting for safety and accuracy. Patients almost always fast before surgery involving general anesthesia. This prevents pulmonary aspiration, which is when a person inhales vomit into their lungs. Fasting is also required for certain diagnostic tests, such as lipid panels to check cholesterol. These tests require a baseline that is not affected by recent food intake. However, doctors must be careful of refeeding syndrome. This is a dangerous metabolic disturbance that occurs when someone eats too much too quickly after being starved or malnourished. It can cause imbalances in potassium, magnesium, and phosphate, which may lead to death.

Many world religions include fasting as a core practice. In Islam, Muslims fast during the month of Ramadan from dawn until sunset. Judaism observes several fasts, such as Yom Kippur and Tisha B'Av, which can last 25 hours. In Christianity, many observe fasting during Lent. The Catholic Church has specific rules regarding abstinence on Fridays and during penitential times. Eastern Orthodox Christians fast during various seasons, including the Nativity Fast and the Apostles' Fast. Members of the Church of Jesus Christ of Latter-day Saints participate in a monthly fast where they donate the money saved from meals to help others.

Fasting also relates to broader discussions about health and weight. Research on alternate-day fasting shows it can improve cardiovascular biomarkers in overweight adults. A 2021 review found that moderate alternate-day fasting for two to six months helped reduce body mass index. Regarding weight loss during prolonged fasting, the body loses about 0.9 kg per day during the first week. By the third week, this average drops to 0.3 kg per day. In the early gluconeogenic phase, about two-thirds of weight lost is lean muscle mass. After this phase, the ratio of body fat lost to lean tissue lost becomes roughly 7:6. While some use it for weight management, there is no sound clinical evidence that fasting promotes longevity in humans.