Fasting for longer than 3 days should only be carried out after seeking the advice of a medical professional.įasting can be mentally and physically tiring, so people must carefully prepare themselves by: If someone has not fasted before, they should consider starting with a 1-day fast to try it out and make sure there are no adverse effects. Ideally, a person will fast in the comfort of their home while resting. Share on Pinterest It is best to perform a water fast is when not working or unwell. Fasting can have adverse effects on the immune system for older adults, so individuals should seek medical advice on whether occasional water fasting could be beneficial.
There have not been extensive human studies on fasting, although research has found some positive impact on blood pressure, body weight, and improved rheumatoid arthritis symptoms from small studies.
Fasting regularly for short periods of time has been associated with lower rates of diabetes, a lower BMI, and a reduced risk of coronary artery disease in people being tested for blocked arteries. Research based on studies with mice and rats suggests that fasting may protect against certain diseases, such as diabetes, and has the potential to delay aging. Intermittent fasting was found to be as easy to stick to as a low-calorie diet. In a study comparing intermittent fasting and eating an ongoing low-calorie diet, both methods were found to be equally good for weight loss, as well as reducing the risk of cancer, diabetes, and heart disease. An example is the 5:2 diet, where someone eats a regular diet for 5 days in the week, and a quarter of their daily calories on the remaining 2 days. This means eating nothing or very few calories for a certain amount of time and then eating as usual for another set period. An alternative to long periods of fasting can be intermittent fasting.
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