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Yo-yo dieting could be good for you

Repeatedly losing and regaining weight may lead to improved insulin levels and lower body fat percentages in the long term, even during weight regain phases.

Previous research has shown that many people fall into the pattern of losing and regaining weight.

Some studies suggest that this pattern, called ‘weight cycling’ or ‘yo-yo dieting,’ has been associated with health risks such as high blood pressure and high cholesterol. However, little is known about hormone regulation and body fat composition after multiple episodes of weight cycling.

This first-of-its-kind research by the American Physiological Society studied rats that were exposed to four cycles of calorie-restricted weight loss followed by weight regain through unlimited access to food (‘weight cyclers’) over the course of a year.

The weight cyclers were compared with a control group of rats that had unlimited access to food for the full trial period.

By the end of the year-long trial, the control group had gained a significant amount of weight. During each regain period, the rats in the weight cycler group added more weight than they had they lost. However, by the third cycle of weight loss and regain, those rats weighed far less than their control counterparts. 

After the first cycle, when compared with the controls, the weight cyclers ate less during the weight regain periods and had lower body fat mass and insulin levels.

In addition, there was no difference in levels of leptin and ghrelin – hormones that control hunger, appetite and weight regulation – between the two groups, which, the research team explained, suggests hormone levels remained stable even throughout periods of weight cycling.

“The improvement in fat mass as well as improvement in glucose tolerance seen in our rats that had undergone weight cycling implies metabolic benefits to the periods of caloric restriction, despite the stress of the weight gain times,” the researchers wrote.

“Future research should focus on the health implications of weight cycling, including whether there is beneficial impact on metabolic syndrome.

“If our findings do apply to humans, then patients and clinicians can take heart that it may be better to try [to lose weight] and eventually regain weight after weight loss by calorie restriction, even repeatedly, than not to try at all,” the researchers added.

Have you tried and failed to lose weight? Does this research give you a boost, knowing that it may have provided some health benefits?

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Ben Hocking
Ben Hocking
Ben Hocking is a skilled writer and editor with interests and expertise in politics, government, Centrelink, finance, health, retirement income, superannuation, Wordle and sports.
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