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[Intermittent fasting : A solution for metabolic disorders?].
Collet, TH, Pataky, Z
Revue medicale suisse. 2021;(720-1):59-62
Abstract
The management of obesity comprises lifestyle changes targeting nutrient content, eating behavior and regular physical activity. Medication (orlistat, liraglutide) and bariatric surgery can later be used, but they require a clear indication and a close follow-up. Studies in chronobiology are now exploring the metabolic benefits of intermittent fasting, which restricts food intake and calorie-containing beverages to a certain window of the 24h cycle, or to certain days of the week/month, thus reinstating the alternance between anabolism and catabolism. However, the current scientific evidence is limited by the sample size and duration of the studies. It is therefore too early for a blanket strategy based on intermittent fasting in all patients with metabolic disorders.
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Intermittent Fasting and Metabolic Health: From Religious Fast to Time-Restricted Feeding.
Hoddy, KK, Marlatt, KL, Çetinkaya, H, Ravussin, E
Obesity (Silver Spring, Md.). 2020;(Suppl 1):S29-S37
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Abstract
Over the past 10 to 15 years, intermittent fasting has emerged as an unconventional approach to reduce body weight and improve metabolic health beyond simple calorie restriction. In this review, we summarize findings related to Ramadan and Sunnah fasting. We then discuss the role of caloric restriction not only as an intervention for weight control, but importantly, as a strategy for healthy aging and longevity. Finally, we review the four most common intermittent fasting (IF) strategies used to date for weight management and to improve cardiometabolic health. Weight loss is common after IF but does not appear to be different than daily caloric restriction when compared directly. IF may also provide additional cardiometabolic benefit, such as insulin sensitization, that is independent from weight loss. While no specific fasting regimen stands out as superior at this time, there is indeed heterogeneity in responses to these different IF diets. This suggests that one dietary regimen may not be ideally suited for every individual. Future studies should consider strategies for tailoring dietary prescriptions, including IF, based on advanced phenotyping and genotyping prior to diet initiation.
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Energy Restriction and Colorectal Cancer: A Call for Additional Research.
Castejón, M, Plaza, A, Martinez-Romero, J, Fernandez-Marcos, PJ, Cabo, R, Diaz-Ruiz, A
Nutrients. 2020;(1)
Abstract
: Colorectal cancer has the second highest cancer-related mortality rate, with an estimated 881,000 deaths worldwide in 2018. The urgent need to reduce the incidence and mortality rate requires innovative strategies to improve prevention, early diagnosis, prognostic biomarkers, and treatment effectiveness. Caloric restriction (CR) is known as the most robust nutritional intervention that extends lifespan and delays the progression of age-related diseases, with remarkable results for cancer protection. Other forms of energy restriction, such as periodic fasting, intermittent fasting, or fasting-mimicking diets, with or without reduction of total calorie intake, recapitulate the effects of chronic CR and confer a wide range of beneficial effects towards health and survival, including anti-cancer properties. In this review, the known molecular, cellular, and organismal effects of energy restriction in oncology will be discussed. Energy-restriction-based strategies implemented in colorectal models and clinical trials will be also revised. While energy restriction constitutes a promising intervention for the prevention and treatment of several malignant neoplasms, further investigations are essential to dissect the interplay between fundamental aspects of energy intake, such as feeding patterns, fasting length, or diet composition, with all of them influencing health and disease or cancer effects. Currently, effectiveness, safety, and practicability of different forms of fasting to fight cancer, particularly colorectal cancer, should still be contemplated with caution.
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Intermittent fasting as a nutrition approach against obesity and metabolic disease.
Zhu, S, Surampudi, P, Rosharavan, B, Chondronikola, M
Current opinion in clinical nutrition and metabolic care. 2020;(6):387-394
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Abstract
PURPOSE OF REVIEW Intermittent fasting has been proposed as a potential nutrition approach against obesity and metabolic disease. Although data from studies in rodents convincingly support the antiobesity and cardiometabolic benefits of intermittent fasting, its effects in human health are still debatable. RECENT FINDINGS Recent studies have examined the effect of two intermittent fasting approaches, that is, alternate day fasting (ADF) and time-restricted eating (TRE), on weight loss and cardiometabolic risk factors. ADF seems to be an equally effective weight loss approach to caloric restriction, but adherence to ADF is more challenging. ADF improves cardiometabolic risk factors, whereas it may have superior metabolic benefits compared to caloric restriction in people with insulin resistance. TRE with ad libitum food intake is well tolerated and induces 2-4% weight loss in approximatively 3 months. Additionally, TRE may have metabolic benefits particularly in people with metabolically abnormal obesity even without weight loss. SUMMARY Intermittent fasting is a promising nutritional approach against obesity and its related metabolic diseases. Further research is needed to: i) establish the long-term effectiveness of TRE in weight loss and metabolic health, ii) improve the long-term adherence to ADF and investigate its weight loss independent effects in metabolic health, and iii) determine the mechanisms underlying the potential cardiometabolic benefits of intermittent fasting in humans.
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Fasting for weight loss: an effective strategy or latest dieting trend?
Johnstone, A
International journal of obesity (2005). 2015;(5):727-33
Abstract
With the increasing obesity epidemic comes the search for effective dietary approaches for calorie restriction and weight loss. Here I examine whether fasting is the latest 'fad diet' as portrayed in popular media and discuss whether it is a safe and effective approach or whether it is an idiosyncratic diet trend that promotes short-term weight loss, with no concern for long-term weight maintenance. Fasting has long been used under historical and experimental conditions and has recently been popularised by 'intermittent fasting' or 'modified fasting' regimes, in which a very low-calorie allowance is allowed, on alternate days (ADF) or 2 days a week (5:2 diet), where 'normal' eating is resumed on non-diet days. It is a simple concept, which makes it easy to follow with no difficult calorie counting every other day. This approach does seem to promote weight loss, but is linked to hunger, which can be a limiting factor for maintaining food restriction. The potential health benefits of fasting can be related to both the acute food restriction and chronic influence of weight loss; the long-term effect of chronic food restriction in humans is not yet clear, but may be a potentially interesting future dietary strategy for longevity, particularly given the overweight epidemic. One approach does not fit all in the quest to achieve body weight control, but this could be a dietary strategy for consideration. With the obesity epidemic comes the search for dietary strategies to (i) prevent weight gain, (ii) promote weight loss and (iii) prevent weight regain. With over half of the population of the United Kingdom and other developed countries being collectively overweight or obese, there is considerable pressure to achieve these goals, from both a public health and a clinical perspective. Certainly not one dietary approach will solve these complex problems. Although there is some long-term success with gastric surgical options for morbid obesity, there is still a requirement for dietary approaches for weight management for the overweight and obese population, particularly as invasive interventions carry post-operative risk of death due to complications. Effective dietary interventions are required that promote long-term adherence and sustained beneficial effects on metabolic and disease markers. In general, such interventions need to be palatable and satiating, meet minimal nutritional requirements, promote loss of fat and preserve lean body mass, ensure long-term safety, be simple to administer and monitor and have widespread public health utility. Intermittent fasting or alternate day fasting may be an option for achieving weight loss and maintenance.