Before you crawl into bed tonight, turn out the lights andpower down your devices. Exposure to artificial light — from sources such as overhead lights, smartphones and televisions — was associated with higher rates of obesity, according to newresearchpublished in JAMA Internal Medicine.
The study included almost 44,000 women between the ages of 35–74 over a six-year period and found women who were exposed to artificial light while sleeping had a 17% higher risk of gaining approximately 11 pounds compared to those who slept in the dark; their rates of obesity were 33% higher. Women who fell asleep with a television or light on were also more apt to gain weight and become overweight or obese over time.
LIGHT AND CIRCADIAN RHYTHM
“Humans are genetically adapted to be active during daylight andsleepin darkness at night,” explains lead author Dr. Yong-Moon (“Mark”) Park, MD, postdoctoral fellow at the National Institutes of Health. “Exposure to light at night while sleeping could alter the body’s 24-hourbody clockleading to激素的变化and other biological processes that regulate sleep, appetite and weight gain.”
While the study focused on exposure to artificial light in the bedroom but Park notes that light coming from outside the room — from other rooms or street lights, for example — was also associated with a slightly increased risk of weight gain. The study did not explore whether overall exposure to artificial light, including daytime exposures, had an impact on weight.
THE SLEEP-WEIGHT CONNECTION
Several studies have linked sleep issues, including insomnia, sleep duration and sleep disruptions, to higher rates of obesity.Researchpublished in the journal Sleep Medicine found the incidence of obesity was higher among those who slept fewer than six hours or more than nine hours per night; chronic insomnia was also associated with higher BMI, according to onestudy.
The link between sleep and obesity is one reason to make improving sleep a priority, says Lu Qi, MD, PhD, director of the Tulane University Obesity Research Center. But sleep is just one of the knownrisk factors for obesity. Lifestyle factors such as an unhealthy diet, sedentary lifestyle, stress and smoking are also linked to an increased likelihood of being overweight or obese.
THE TAKEAWAY
“Even if you improve your sleep habits, you still need to pay attention to other risk factors,” says Qi. “We also need to be cautious in interpreting these results; artificial light might be a factor but it could be correlated to other habits that were not part of this study.”
帕克同意，并补充说：“尽管我们的研究提供了比以前的其他研究更有力的证据，但仍然没有结论。即便如此，建议人们不要在灯光上睡觉似乎是合理的。在睡前关闭灯可能是我们可以做的简单的事情，以减少体重的机会.”
