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Weight loss through diet changes can improve sleep at any body weight: study |
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By Jane Kitchen 22 Dec 2015 |
Co-author Sigrid Veasey, a professor in the division of Sleep Medicine and a member of Penn’s Center for Sleep and Circadian Neurobiology, said the study has mapped a completely novel food and sleep interaction Credit: Shutterstock / 312824243
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Weight loss due to dietary changes can improve sleepiness at any weight, says a new study published by researchers from the Perelman School of Medicine at the University of Pennsylvania this month in the journal Sleep. The findings offer new insights into how weight fluctuations impact numerous aspects of sleep independent of body weight.
Previous studies have linked obesity with persistent sleepiness, lack of energy during the day, and poor sleep quality, all of which can be successfully combatted with weight loss treatment. But until now, researchers have known little about the link between excessive weight, poor dietary habits, and sleep/wake abnormalities.
In the current research, obesity was studied using diet-induced obese mice. Half the mice were randomly chosen to receive regular chow (RC), while the other mice were fed a high-fat diet (HFD, more than three times higher in fat content) for eight weeks.
At the end of that period, some of the mice were switched to the alternative diet for one week, causing newly-fed HFD mice to gain weight and newly-fed RC mice to lose weight, while the rest of the mice continued to consume their current diet.
After the ninth week, mice maintained on HFD weighed 30 per cent more, slept more than one hour longer per day, and suffered from increased wake fragmentation (frequently slipping into sleep) compared to mice maintained on RC. The ‘diet switch’ groups, however, had similar body weight at week nine, but completely different sleep/wake profiles when compared to each other.
“Our findings suggest body weight is a less important factor than changes in weight for regulating sleepiness,” said the study’s lead author, Isaac Perron, a PhD student in Neuroscience at the University of Pennsylvania. “Diet-induced obese mice that ate a regular chow diet for only one week showed the same sleep/wake profile as mice that ate a regular chow diet for nine weeks.”
The findings have implications for the lean population as well, since mice consuming the low-fat diet for eight weeks followed by only one week of HFD had similar sleep as those eating a HFD for nine weeks.
“The diet consumed during the final week was key to driving the sleep effects, independent of the starting body weight,” said Perron. “If you’re overweight and often feel tired, you may not need to lose all the weight to improve sleep, but rather just beginning to lose that excess weight may improve your sleep abnormalities and wake impairments.”
Co-author Sigrid Veasey, a professor in the division of Sleep Medicine and a member of Penn’s Center for Sleep and Circadian Neurobiology, said the study has mapped a completely novel food and sleep interaction.
“That changing to a healthier diet can acutely improve alertness and sleep is extremely important and certainly an interaction to now test in humans,” said Veasey.
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