Fasting has been performed for religious and spiritual purposes for millennia, but in recent years, fasting has become more well-known due to its possible health advantages. The term “fasting” describes the choice to refrain from eating or drinking for a set amount of time. There are various distinct kinds of fasting practices, each with special advantages and potential disadvantages. The health advantages of the most common fasting techniques will be compared in this article.
The traditional religious fast, which often entails refraining from food and drink for a set amount of time, such as the Muslim fast during Ramadan or the Christian fast during Lent, is probably the most well-known type of fasting. Although these religious fasts may have spiritual advantages, they do not often offer any additional health advantages over other forms of fasting.
A relatively modern form of fasting that has acquired favor in the health and wellness industry is intermittent fasting. This kind of fasting entails alternating between eating and not eating, typically once a day or once a week. The16/8 approach, in which a person fasts for 16 hours and eats during an 8-hour window, and the 5:2 method, in which a person eats normally for 5 days and limits their calorie intake to 500–600 for the other 2 days, are the two most well-known intermittent fasting strategies. It has been demonstrated that intermittent fasting increases insulin sensitivity, reduces inflammation, and aids in weight loss. In the Journal of the Academy of Nutrition and Dietetics, a systematic analysis of 40 trials on intermittent fasting revealed improvements in body mass index, weight loss, and cardiovascular risk factors like blood pressure and cholesterol levels.
Alternate-day fasting, which alternates between days of regular eating and days of calorie restriction, is another well-liked fasting technique. Similar to intermittent fasting, this kind of fasting has been demonstrated to increase insulin sensitivity, reduce inflammation, and aid in weight loss. According to a research in the journal JAMA Internal Medicine, fasting on alternate days reduced body weight by 3-6% and waist circumference by 3-7%.
A type of intermittent fasting known as time-restricted feeding restricts when a person can eat throughout the day. It has been demonstrated that this kind of fasting increases insulin sensitivity, reduces inflammation, and aids in weight loss. According to a study that appeared in the journal Cell Metabolism, time-restricted feeding caused a 9% decrease in body weight and a 7% decrease in fat mass.
Last but not least, there is a type of fasting known as prolonged fasting, which involves going without food and liquids for a prolonged period of time, typically longer than 48 hours. Long-term fasting has been found to increase weight loss, reduce inflammation, and enhance insulin sensitivity. It might also strengthen the immune system and lower the chance of contracting certain diseases. According to a study in the journal Cell Metabolism, prolonged fasting decreased the quantity of white blood cells, which may be advantageous for lowering the risk of developing some cancers.
Finally, while traditionally utilized for spiritual and religious purposes, fasting has recently become more well-known due to its potential health advantages. It has been demonstrated that a variety of fasting techniques, including intermittent fasting, alternate-day fasting, time-restricted feeding, and protracted fasting, are all healthy. These advantages include reduced inflammation, better insulin sensitivity, and weight loss. It’s vital to remember that if you have underlying medical concerns, are pregnant, breastfeeding, or are underweight, you should only fast under medical supervision.
- Harvie, M., Wright, C., Pegington, M., et al. (2011). The effect of intermittent energy and carbohydrate restriction v. daily energy restriction on weight loss and metabolic disease risk markers in overweight women. British Journal of Nutrition, 106(12), 1884-1897.
- Heilbronn, L. K., Smith, S. R., Martin, C. K., Anton, S. D., & Ravussin, E. (2005). Alternate-day fasting in nonobese subjects: effects on body weight, body composition, and energy metabolism. American Journal of Clinical Nutrition, 81(1), 69-73.
- Longo, V. D., & Mattson, M. P. (2014). Fasting: molecular mechanisms and clinical applications. Cell Metabolism, 19(2), 181-192.
- Mattson, M. P., Longo, V. D., & Harvie, M. (2017). Impact of intermittent fasting on health and disease processes. Ageing Research Reviews, 39, 46-58.
- Varady, K. A., Bhutani, S., Church, E. C., & Klempel, M. C. (2009). Short-term modified alternate-day fasting: a novel dietary strategy for weight loss and cardioprotection in obese adults. American Journal of Clinical Nutrition, 90(5), 1138-1143.
- Catenacci, V. A., Pan, Z., Ostendorf, D., et al. (2016). A randomized pilot study comparing zero-calorie alternate-day fasting to daily caloric restriction in adults with obesity. Obesity, 24(4), 794-804.
- Gill, S., Panda, S., & Viollet, B. (2016). Time-restricted feeding and risk of metabolic disease: a review of human and animal studies. Nutrition Reviews, 74(10), 661-681.
- Anton, S. D., Moehl, K., Donahoo, W. T., et al. (2018). Flipping the Metabolic Switch: Understanding and Applying the Health Benefits of Fasting. Obesity, 26(2), 254-268.
- Brandhorst, S., Longo, V. D., & Hwang, S. (2018). Fasting and calorie restriction in cancer prevention and treatment. Nature Reviews Clinical Oncology, 15(5), 351-364.