The 5:2 diet,
or fast diet, is a diet which involves severe calorie restriction for two non-consecutive days a week and normal eating the other five days, which originated and became popular in the UK, and spread in Europe and to the USA. It is a form of intermittent fasting.
The diet is claimed to promote weight loss and to have several beneficial effects on health; however, there is little evidence about the safety and effectiveness of the diet.
A review of a book promoting this diet by the Academy of Nutrition and Dietetics concluded, “It is not something that is good behaviourally, and it is not a realistic long-term solution. It also does not complement other healthy lifestyle components, such as being physically active and achieving quality sleep,” before finally concluding that diet is not recommended.
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