Taking a break from your diet may improve weight loss

Embargoed until: Publicly released:
Avoiding continuous dieting may be the key to losing weight and keeping the kilos off, new research shows. In a controlled study, the University of Tasmania's Professor Nuala Byrne found participants who took a two weeks on, two weeks off approach lost more weight, and kept it off for longer, than people who dieted continuously.

Journal/conference: International Journal of Obesity

Organisation/s: University of Tasmania, Queensland University of Technology (QUT), The University of Sydney

Funder: National Health and Medical Research Council

Media Release

From: University of Tasmania

Avoiding continuous dieting may be the key to losing weight and keeping the kilos off, the latest University of Tasmania research shows.

In findings published today in the International Journal for Obesity, School of Health Sciences researchers showed in a randomised controlled trial, that taking a two-week break during dieting may improve weight loss.

The study, funded by the National Health and Medical Research Council (NHMRC) of Australia, investigated the body’s ‘famine reaction’ to continued dieting and its impact on weight loss in men with obesity.

During the study, two groups of participants took part in a 16-week diet which cut calorie intake by one third.

One group maintained the diet continuously for 16 weeks while the other maintained the diet for two weeks, then broke from the diet for two weeks eating simply to keep their weight stable, and repeated this cycle for 30 weeks in total to ensure 16 weeks of dieting.

Those in the intermittent diet group not only lost more weight, but also gained less weight after the trial finished.

The intermittent diet group maintained an average weight loss of 8 kg more than the continuous diet group, six months after the end of the diet.

Head of the University of Tasmania’s School of Health Sciences Professor Nuala Byrne, who led the study with a team of collaborators from Queensland University of Technology and the University of Sydney, said dieting altered a series of biological processes in the body, which led to slower weight loss, and possibly weight gain.

“When we reduce our energy (food) intake during dieting, resting metabolism decreases to a greater extent than expected; a phenomenon termed ‘adaptive thermogenesis’ – making weight loss harder to achieve,” Professor Byrne said.

“This ‘famine reaction’, a survival mechanism which helped humans to survive as a species when food supply was inconsistent in millennia past, is now contributing to our growing waistlines when the food supply is readily available.”

Professor Byrne said while researchers in the past had shown that as dieting continued weight loss became more difficult, this latest MATADOR (Minimising Adaptive Thermogenesis And Deactivating Obesity Rebound) study looked more closely at ways to lessen the famine response and improve weight loss success.

However Professor Byrne said while this two-week intermittent diet proved to be a more successful means of weight loss compared with continuous dieting, other popular diets which included cycles of several days of fasting and feasting were not any more effective that continuous dieting.

“There is a growing body of research which has shown that diets which use one to seven day periods of complete or partial fasting alternated with ad libitum food intake, are not more effective for weight loss than conventional continuous dieting,” she said.

“It seems that the ‘breaks’ from dieting we have used in this study may be critical to the success of this approach.

“While further investigations are needed around this intermittent dieting approach, findings from this study provide preliminary support for the model as a superior alternative to continuous dieting for weight loss.”

The primary outcome findings from the MATADOR study are due for publication in the International Journal of Obesity on Tuesday 19 September, 2017: http://rdcu.be/u4Dt

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Multimedia:

  • Professor Nuala Byrne

    The University of Tasmania's Professor Nuala Byrne explains the intermittent diet approach and why the two weeks on, two weeks off strategy may be a winner.

    File Size: 81.2 MB

    Attribution: The University of Tasmania

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    Last Modified: 19 Sep 2017 9:15am

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  • Professor Nuala Byrne
    Professor Nuala Byrne

    Professor Nuala Byrne, Head of School of Health Science, University of Tasmania

    File Size: 3.5 MB

    Attribution: The University of Tasmania

    Permission Category: Free to share or modify (must credit)

    Last Modified: 19 Sep 2017 9:15am

    Note: High resolution files are only available for download by registered journalists.

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