Francisco J. Tinahones
President of the SEEDO Foundation and the Spanish Society of Endocrinology and Nutrition (SEEN)
The article does not say that intermittent fasting is not effective for weight loss. What it does say is that, based on the studies included so far, there is no evidence that it is superior to classic calorie restriction in terms of weight loss. Most researchers agree on this point and on the need for more clinical trials of longer duration to see if it really offers more benefits than the classic low-calorie diet.
But we do have evidence that it is an alternative for weight loss that is, at a minimum, as effective as classic calorie restriction.
The study is an analysis of clinical trials to date comparing intermittent fasting with the classic diet. There are currently many trials underway and others that have been recently published that have probably not been included.