Intermittent fasting is popular—but it doesn't work for weight loss - Medical Xpress

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The currently popular diet of intermittent fasting that restricts eating to eight hours per day, separated by 16 hours of fasting, is not effective on its own as a means of either losing weight or for improving key metabolic health markers, according to a new study led by researchers at UC San Francisco.

While time-restricted feeding has been shown to prevent weight gain in mice on a high-fat diet and reduces weight and metabolic outcomes in already obese mice, most of the reported benefits of such fasting in humans has had limited scientific testing.

This study, which included 116 men and women with a body mass index (BMI) of 27 to 46, found that people who were randomly assigned to only eat during an eight-hour period each day lost 2 lbs. (0.94 kg) on average over the 12-week period, while those with consistent meal timing lost an average of 1.5 lbs. (0.68 kg).

The study found no significant difference between the two groups in total weight loss or in other markers, such as fat mass, lean mass, fasting insulin or glucose, HbA1C levels, energy intake, or total or resting energy expenditure.

First author Dylan A. Lowe, Ph.D., and corresponding author Ethan J. Weiss, M.D., are both affiliated with the UCSF Cardiovascular Research Institute. Additional findings, authors and affiliations can be found in the paper, published Sept. 28, 2020, in JAMA Internal Medicine.

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Do fasting diets really work? New study finds little benefit

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More information: Dylan A. Lowe et al. Effects of Time-Restricted Eating on Weight Loss and Other Metabolic Parameters in Women and Men With Overweight and Obesity, JAMA Internal Medicine (2020). DOI: 10.1001/jamainternmed.2020.4153

Provided by University of California, San Francisco

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