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Poor sleep may hinder attempts to maintain weight loss, study finds – The Guardian

May 5, 2022
in Health News
0
Poor sleep may hinder attempts to maintain weight loss, study finds – The Guardian
Obesity

Trial seems to add to body of evidence about health risks of not getting enough sleep or poor quality sleep

Poor sleep may undermine attempts to maintain weight loss, research has suggested.

Millions of people who are overweight or obese manage to lose weight every year. But many often then face a struggle to keep the pounds creeping back.

Now results from a randomised trial, which was conducted by the University of Copenhagen and presented at the European Congress on Obesity, suggests better and longer sleep patterns could help keep the weight off for good.

It is well known that not getting enough or poor quality sleep increases the risk of high blood pressure, high cholesterol and fatty deposits building up in the arteries.

Not getting enough sleep has also been linked to diabetes, inflammation and heart disease. Scientists now increasingly believe poor sleep may be a contributing factor in weight regain after weight loss.

In the study, 195 adults who were obese and aged between 18 and 65 followed a very low-calorie diet (800 kcal/day) for eight weeks, losing on average 12% of their bodyweight.

They were then tracked for a year. Their sleep duration was measured using data from wearable monitors and their sleep quality was measured with the Pittsburgh sleep quality index (PSQI), a self-rated questionnaire.

Those who slept for less than six hours a night were found to have, on average, increased their body mass index (BMI) by 1.3 points after a year compared with those who slept for more than six hours.

Similarly, the BMI for those who had poor quality sleep increased by 1.2 points after a year compared with those whose sleep was of a good quality. The authors noted the study was observational and could not prove that poor sleep caused weight changes, but suggested that it was likely to contribute.

“The fact that sleep health was so strongly related to weight loss maintenance is important since many of us don’t get the recommended amount of sleep needed for optimal health and functioning,” said Prof Signe Torekov, of the University of Copenhagen.

More than a third of adults in the UK and the US do not frequently get enough sleep, previous research has found, largely owing to a host of factors in modern life including stress, computers, smart devices and the blurring of work-life boundaries.

The study also found about two hours of vigorous physical activity a week could help maintain better sleep.

“Future research examining possible ways of improving sleep in adults with obesity will be an important next step to limit weight regain,” said Torekov. “Weight loss maintained with exercise seems promising in improving sleep.”

Meanwhile, a second study presented at the conference found more than 1,300 prostate cancer deaths in the UK could potentially be prevented every year if the average man was not overweight.

The mechanisms behind the findings are still unknown, but researchers said the UK Biobank study, which was published in the journal BMC Medicine, suggests men should try to maintain a healthy weight.

“Knowing more about factors that increase the risk of prostate cancer is key to preventing it,” said the study lead Dr Aurora Pérez-Cornago at the University of Oxford. “Age, family history and black ethnicity are known risk factors but they are not modifiable, so it is important to discover risk factors that it is possible to change.”

A third study presented at the conference found almost a quarter of obese teenagers havd no idea that they were obese, despite most of them being worried about the effect of weight on their future health.

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