Buenos Aires, Argentina — A comprehensive review of scientific studies has cast doubts on the effectiveness of intermittent fasting for weight loss, suggesting that traditional dieting methods may yield similar or even superior results. Researchers evaluated findings from 22 studies worldwide to assess how overweight individuals responded to various dietary approaches, including the popular 5:2 fasting method.
The review revealed that individuals who practiced intermittent fasting typically lost only around 3% of their body weight, a figure that falls short of the 5% threshold deemed clinically significant by health experts. Critics of fasting diets emphasize that the minimal weight loss associated with these practices is hardly more beneficial than taking no dietary action at all.
Dr. Luis Garegnani, who led the research at the Cochrane Associate Centre in Buenos Aires, clarified that intermittent fasting should not be viewed as a miracle cure. “It may serve as one option among many for weight management. The results are comparable to traditional dietary methods; it neither outperforms nor underperforms them,” he stated.
Intermittent fasting, which involves eating during specific hours or fasting on designated days, has gained a following due to claims of various benefits, including enhanced overall health and the potential to slow down aging. This study involved a rigorous evaluation of randomized clinical trials involving nearly 2,000 participants across five continents, looking into different fasting methods, such as alternate-day fasting and time-restricted eating.
Despite some enthusiasm for these diets, the analysis found no compelling evidence indicating that intermittent fasting enhances individuals’ quality of life in a way that surpasses other diet plans. Garegnani pointed out that many studies were short-term and of questionable quality, complicating any definitive assessment of the benefits of fasting. Notably, none of the trials surveyed participants about their satisfaction levels with intermittent fasting.
Dr. Zhila Semnani-Azad from the National University of Singapore suggested that the effectiveness of intermittent fasting could be influenced by timing, as the body’s rhythms play a critical role in metabolic processes. Animal studies indicate that fasting may alter fat utilization, improve insulin sensitivity, and lower inflammation. Semnani-Azad also mentioned that fasting triggers autophagy, a cellular recycling process that could contribute to longevity.
Maik Pietzner, a health data modeling professor at the Berlin Institute of Health, expressed surprise over the minimal weight loss from fasting approaches compared to inaction. He noted that reduced physical activity during fasting could explain the findings, emphasizing the difficulty of achieving weight loss without pharmacological interventions. His own research indicates that only prolonged fasting habits lead to significant physiological changes.
While the findings may suggest that intermittent fasting is not a robust solution for weight control, Pietzner acknowledged that individuals who feel better on such diets should not be discouraged. “Despite the lack of substantial evidence supporting significant advantages, if someone feels positive about their diet regimen, they should continue,” he said.
Ultimately, the study adds to the ongoing dialogue about dietary strategies for weight loss, highlighting the need for further research to understand various approaches’ true impact on health and well-being.