Cochrane have done a review.
ABC article of intermittent fasting ‘fail to match the hype’, major review finds
The Cochrane report of intermittent fasting ‘fail to match the hype’, major review finds
>>Compared to regular dietary advice, intermittent fasting may result in little to no difference in weight loss or quality of life. Intermittent fasting may result in little to no difference in adverse events, but the evidence is very uncertain. These approaches did not differ in achieving weight loss, producing no clinically meaningful changes in most of the outcomes considered in this review. Compared to no intervention or waiting list, intermittent fasting likely results in little to no difference in weight loss and may result in little to no difference in quality of life or adverse events, but the evidence is very uncertain. <<