Weight loss through diet changes can improve sleep at any body weight, says study

December 16, 2015
Credit: Vera Kratochvil/public domain

Weight loss due to dietary changes can improve sleepiness at any weight, says a 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 loss treatment. But until now, researchers have known little about the link between excessive weight, poor dietary habits, and sleep/wake abnormalities.

Nearly 185 million adults and 24 million children in the United States are overweight or obese. In Philadelphia, an estimated 68 percent of adults are overweight or obese. Beyond impaired cognitive function, poor sleep is associated with a host of chronic health problems including depression, obesity, and hypertension. Additionally, the Centers for Disease Control and Prevention estimates that 50 to 70 million U.S. adults experience sleep or wakefulness disorders.

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 percent 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 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."

As individuals pursue these , they may start to feel more awake during the day and be motivated to live a healthier lifestyle.

"This study has mapped a completely novel food and sleep interaction," said co-author Sigrid Veasey, MD, DABSM, a professor in the division of Sleep Medicine and a member of Penn's Center for Sleep and Circadian Neurobiology.

"That changing to a healthier can acutely improve alertness and , is extremely important and certainly an interaction to now test in humans."

Allan I. Pack, also from Penn, is a co-author on the study.

Explore further: Weight gain induced by high-fat diet increases active-period sleep and sleep fragmentation

More information: Isaac J. Perron et al. Diet/Energy Balance Affect Sleep and Wakefulness Independent of Body Weight, SLEEP (2015). DOI: 10.5665/sleep.5236

Related Stories

Adequate sleep helps weight loss

September 17, 2012

Adequate sleep is an important part of a weight loss plan and should be added to the recommended mix of diet and exercise, states a commentary in CMAJ (Canadian Medical Association Journal).

Just a half hour of lost sleep linked weight gain

March 5, 2015

(HealthDay)—Think twice the next time you don't get as much sleep as you need: A new study suggests that missing just 30 minutes of shuteye during weeknights could boost your weight and disrupt your metabolism.

Recommended for you

Tackling childhood obesity using structured play times

March 17, 2017

How important is physical activity in children under 5? It's a question Trish Tucker, a professor in the School of Occupational Therapy, tackles on a daily basis. She's currently involved in a major research project that ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.