Leena Watts
Intermittent fasting has been practised for thousands of years, with roots in various religious traditions, including Christianity, Hinduism, Islam, Judaism, and Buddhism. In the modern era, it has become a popular diet trend, with people adopting it for weight management and to address chronic conditions such as irritable bowel syndrome, high cholesterol, or arthritis. The concept of intermittent fasting focuses on when you eat, rather than what you eat, with various methods such as alternate-day fasting, periodic fasting, and daily time-restricted eating. While it has gained attention for its potential weight loss benefits, there is limited evidence to support this claim, and it may not be suitable for everyone.
| Characteristics | Values |
|---|---|
| Creator(s) | Johns Hopkins neuroscientist Mark Mattson, Michael Mosley, Michelle Harvie, and 14 additional scientists |
| Date of Creation | 2011 |
| Publication | A 2011 article, later published in the UK and Australia by Michael Mosley through the 2012 BBC documentary "Eat, Fast and Live Longer" |
| Purpose | Weight management, and addressing chronic conditions such as irritable bowel syndrome, high cholesterol, or arthritis |
| Benefits | May help with obesity, insulin resistance, dyslipidemia, hypertension, and inflammation |
| Risks | May cause continuous feelings of hunger, irritability, dizziness, nausea, headaches, and impaired thinking |
| Recommendations | Not recommended for pregnant or breastfeeding women, growing children and adolescents, the elderly, or individuals with or vulnerable to eating disorders |
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What You'll Learn
Intermittent fasting for weight loss
Intermittent fasting is an eating pattern that involves switching between fasting and eating on a regular schedule. It focuses on when you eat rather than what you eat, allowing for a range of different foods to be consumed. This dietary approach has gained popularity due to its perceived benefits for weight loss and the prevention or management of certain diseases.
There are several ways to practice intermittent fasting, including daily time-restricted eating, alternate-day fasting, and periodic fasting. The 16/8 method, for example, involves eating during an eight-hour window and fasting for the remaining 16 hours of the day. The 5:2 approach, on the other hand, involves eating regularly for five days and restricting intake to one 500-600 calorie meal for the remaining two days.
Research suggests that intermittent fasting can be effective for weight loss. Studies have shown that it can lead to a weight loss of 2.5% to 9.9% of body weight, with fat mass loss and some lean mass loss. Intermittent fasting has also been found to improve metabolic and cardiovascular biomarkers, similar to a calorie-restricted diet. Young men who fasted for 16 hours experienced fat loss while maintaining muscle mass. Additionally, animal studies indicate that intermittent fasting can prevent obesity and improve surgical tissue health.
However, it is important to note that intermittent fasting may not be suitable for everyone. It is recommended that certain individuals, including children, pregnant or breastfeeding women, and people with type 1 diabetes who take insulin, should avoid intermittent fasting. Some people may experience adverse effects such as continuous hunger, irritability, dizziness, nausea, headaches, and impaired thinking. It is always advisable to consult a healthcare professional before starting any new dietary regimen.
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Intermittent fasting for chronic conditions
Intermittent fasting is an eating pattern that involves switching between fasting and non-fasting periods. It is often used for weight management, but it has also been proposed as a potential intervention for chronic conditions.
Some people use intermittent fasting to address chronic conditions such as irritable bowel syndrome, high cholesterol, and arthritis. Research in animals has shown that it may be important to synchronise intermittent fasting with daily circadian rhythms. Mice that were fed on alternate days showed better endurance in running, and when their feeding was restricted to normal nocturnal eating times, they were protected from obesity, hyperinsulinemia, hepatic steatosis, and inflammation.
Intermittent fasting has been studied for its potential to reduce the risk of diet-related diseases, such as metabolic syndrome, and a 2019 review concluded that it may help with obesity, insulin resistance, dyslipidemia, hypertension, and inflammation. Intermittent fasting has also been shown to improve blood pressure and resting heart rates, as well as other heart-related measurements.
However, it is important to note that intermittent fasting is not suitable for everyone. It should be avoided by children and teens under 18, women who are pregnant or breastfeeding, and people with type 1 diabetes who take insulin. While it has been shown to be safe for people with type 2 diabetes, there is a concern that it could result in unsafe hypoglycaemia in those with type 1 diabetes.
If you are considering intermittent fasting, it is important to consult your healthcare provider to discuss the potential benefits and risks for your individual situation.
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Intermittent fasting in religious practices
Intermittent fasting is a diet that involves eating only during a specific time period. It has been studied for its potential to reduce the risk of metabolic syndrome and other diet-related diseases, such as obesity, insulin resistance, and hypertension. Intermittent fasting has been practised in various forms for centuries, including in religious contexts.
Christianity
Fasting is a common practice in Christianity, especially during the season of Lent. Some Christians may choose to fast intermittently, shortening their eating window to burn more fat. This practice is often accompanied by prayer and reflection, with the intention of humbling oneself before God.
Islam
Muslims observe the month of Ramadan, during which they abstain from food and drink during daylight hours. This practice is intended to bring Muslims closer to Allah and to empathise with the less fortunate.
Judaism
Fasting is also a part of Jewish religious practices, as seen in the Old Testament. It is often observed on Yom Kippur, one of the most important days in the Jewish calendar, to atone for sins and seek forgiveness.
Hinduism
In Hinduism, Vrata is a form of intermittent fasting that involves abstaining from food and water for a specific period. Devotees may undertake Vrata to seek blessings or fulfil a vow.
Buddhism and Jainism
Buddhist and Jain monks often practise intermittent fasting as a way to detach from worldly pleasures and focus on spiritual enlightenment. This may involve reducing food intake or adhering to specific dietary restrictions.
While the specific methods and motivations may vary, intermittent fasting is a common thread across many religious practices, often serving as a means to connect with a higher power, discipline the body, and improve spiritual and physical well-being.
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Intermittent fasting in animal studies
Intermittent fasting has been studied in animals, with research highlighting the importance of synchronizing fasting regimens with daily circadian rhythms. Mice that were given unlimited access to a high-fat diet and allowed to eat throughout the day and night developed obesity, diabetes, and metabolic syndrome. However, when their feeding was restricted to normal nocturnal eating times, these health issues were prevented. This indicates that the timing of meals is a critical factor in maintaining health.
In animal models, intermittent fasting has been shown to reduce oxidative stress, improve cognition, and delay aging. It also has anti-inflammatory effects, promotes autophagy, and positively influences the gut microbiome. These benefits may be linked to the body's metabolic switch during fasting, which affects cellular growth and repair mechanisms.
Additionally, animal studies have provided insights into the potential benefits of intermittent fasting for humans. For instance, a study in hepatoma cells using human serum collected pre- and post-intervention found increased SIRT1 levels and decreased TG levels, suggesting a potential role in aging and longevity.
While animal studies have contributed valuable knowledge, it is important to note that the conclusions drawn from these studies may not be directly applicable to humans due to differences in biology and metabolism. Further research is needed to fully understand the impact of intermittent fasting on human health and to optimize any potential benefits.
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Intermittent fasting side effects
Intermittent fasting is a diet that focuses on when you eat, rather than what you eat. It involves various meal timing schedules that cycle between voluntary fasting (or reduced calorie intake) and non-fasting over a given period. While it has been studied for its potential health benefits, there are several side effects associated with intermittent fasting that you should be aware of.
Firstly, it is important to note that intermittent fasting is not recommended for everyone. It should be avoided by children, adolescents, pregnant or breastfeeding women, the elderly, and individuals with certain medical conditions or who are taking medications. For example, those with type 1 diabetes who take insulin should be cautious as intermittent fasting may result in unsafe levels of hypoglycemia during the fasting period. Additionally, people with eating disorders or a history of disordered eating should steer clear of intermittent fasting as it may trigger unhealthy behaviours.
Some of the most common side effects of intermittent fasting include increased hunger, irritability, dizziness, nausea, headaches, and impaired thinking. These side effects typically disappear within a month of starting the fasting practice. However, it is important to note that intermittent fasting may also lead to dehydration, which can cause dry mouth and bad breath. Sleep disturbances, such as difficulty falling or staying asleep, are also commonly reported side effects.
Furthermore, intermittent fasting may negatively affect digestion and cause bloating and diarrhoea. It is important to choose nutrient-dense foods rich in fibre to help prevent these digestive issues. Additionally, some people may experience a decrease in their lean body mass while intermittent fasting. This can be mitigated by incorporating an exercise regimen alongside the fasting practice.
While the potential side effects of intermittent fasting are important to consider, it is also worth noting that the effectiveness and safety of different forms of intermittent fasting are still being studied. It is always recommended to consult with a healthcare professional before starting any new diet, especially if you have a medical condition or are taking medications.
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Frequently asked questions
Intermittent fasting has been practised since ancient times, where it was used to help heal the body and deepen one's connection to their faith.
Religious fasting practices include the Black Fast of Christianity, Vrata (Hinduism), Ramadan (Islam), Yom Kippur (Judaism), Fast Sunday (The Church of Jesus Christ of Latter-day Saints), Jain fasting, and Buddhist fasting.
There are a variety of intermittent fasting regimens, including alternate-day fasting, periodic fasting (such as the 5:2 diet), and daily time-restricted eating.
Intermittent fasting is supposed to help with weight loss, improve metabolic health, and potentially reduce the risk of diet-related diseases such as metabolic syndrome, obesity, insulin resistance, dyslipidemia, hypertension, and inflammation.
Some people may experience minor side effects such as continuous feelings of hunger, irritability, dizziness, nausea, headaches, and impaired thinking. Intermittent fasting is not recommended for pregnant or breastfeeding women, children, adolescents, the elderly, or individuals with or vulnerable to eating disorders.
