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This is taken from the article Intermittent Fasting, the link can be found here: Intermittent fasting

Weight
There is some limited evidence that intermittent fasting produces weight loss comparable to a calorie restricted diet. Most studies on intermittent fasting in humans observed weight losses, ranging from 2.5% to 9.9%. Alternate day fasting does not affect lean body mass, although one review found a small decrease. Alternate day fasting improves cardiovascular and metabolic biomarkers similarly to a calorie restriction diet for people who are overweight, obese or have a metabolic syndrome.

Intermittent fasting has not yet been studied in children, the elderly, or underweight people, and could be harmful in these populations. Intermittent fasting is not recommended for people who are not overweight. The long-term sustainability of intermittent fasting was unknown.

Other effects
Night-time eating has been linked to impaired sleep quality. Intermittent fasting (prevention, treatment, drugs interaction) is not recommended to treat cancer in France, the United Kingdom, or the United States, although a few small-scale clinical studies suggest that intermittent fasting may reduce chemotherapy side effects. Periodic fasting may have a minor effect on chronic pain and mood disorders. . Intermittent fasting has shown signs of improving the functional outcome of certain age related disorders including diabetes, cardiovascular disease, cancers and neurological disorders such as Alzheimer's disease and Parkinson's disease. Intermittent fasting does not affect bone health. Athletic performance does not benefit from intermittent fasting. Overnight fasting before exercise increases lipolysis, but reduces performance in prolonged exercise (more than 60 min).

Adverse effects
Reviews of preliminary clinical studies found that short-term intermittent fasting may produce minor adverse effects, such as continuous feelings of hunger, irritability, and impaired thinking, although these effects appear to dissipate within a month of the fasting practice. However, the data remain sparse, as most studies did not analyze adverse effects specifically. A 2018 systematic review found no major adverse effect. Studies have shown that both gross and cellular physiology is profoundly affected by caloric restriction or intermittent fasting practices. Periodic fasting prolonged for several days or weeks may cause eating disorders, malnutrition, increased susceptibility to infectious diseases, moderate damage to organs or sudden death by cardiac failure, either during fasting or upon refeeding. Deaths also happened following therapeutic prolonged periodic fasting. These effects happened after several weeks of fasting. Intermittent fasting has not been reported to produce these effects, but may still cause harm when practiced too frequently or for too many consecutive days. Intermittent fasting is not recommended for pregnant or breastfeeding women, or children and adolescents during maturation, or individuals vulnerable to eating disorders.

2019 clinical guidelines recommended that hospitals ensure that the patients in critical health units get fed with 80–100 % of energy expenditure, normocaloric feeding.