Intermittent fasting, a popular weight-loss trend promoted on social media, may provide no significant advantage over traditional dieting, according to a major new review.

Researchers analyzed 22 randomized clinical trials involving nearly 2,000 adults across North America, Europe, China, Australia, and South America. The review found intermittent fasting—whether limiting meals to an eight-hour daily window or fasting every other day—resulted in “little to no difference” in weight loss compared with standard dietary advice or no intervention.

Lead researcher Luis Garegnani, Ph.D., director of the Universidad Hospital Italiano de Buenos Aires Cochrane Associate Center, said, “Intermittent fasting just doesn't seem to work for overweight or obese adults trying to lose weight. It may be a reasonable option for some people, but the current evidence doesn't justify the enthusiasm we see on social media.”

The review found that intermittent fasting did not meaningfully increase the likelihood of losing at least 5% of body weight, nor did it improve quality of life compared with other diets. Most studies lasted 12 months or less, primarily included White adults from high-income countries, and did not report on long-term sustainability, satisfaction, diabetes outcomes, or overall comorbidities.

Dr. Eva Madrid, director of the Cochrane Evidence Synthesis Unit Iberoamérica, emphasized that doctors should take a case-by-case approach when advising patients on weight loss. Board-certified endocrinologist Dr. Gillian Goddard noted that intermittent fasting may help some individuals, particularly Type 2 diabetes patients or those prone to late-night snacking, but “all diets are just tools,” and sustainability is key.

Health coaches also caution that intermittent fasting does not address nutritional quality or underlying issues such as stress and physiological factors. Experts recommend tracking macronutrients or following established plans like the Mediterranean, vegetarian, or DASH diets for long-term results.