Study: Get enough sleep, avoid obesity

We've know for awhile now that lack of sleep leads to weight gain. Not getting sufficient rest causes low energy, overeating, and even a significantly impaired metabolism. Now, a new studied has shown that people who get less than 7 hours of sleep per night have a much greater risk of becoming obese. The solution? Get enough sleep - at least 7 or 8 hours per night!

From Yahoo! News:

Weight-loss experts have a novel prescription for people who want to shed pounds: Get some sleep. A very large study has found a surprisingly strong link between the amount of shut-eye people get and their risk of becoming obese.

Those who got less than four hours of sleep a night were 73 percent more likely to be obese than those who got the recommended seven to nine hours of rest, scientists discovered. Those who averaged five hours of sleep had 50 percent greater risk, and those who got six hours had 23 percent more.

"Maybe there's a window of opportunity for helping people sleep more, and maybe that would help their weight," said Dr. Steven Heymsfield of Columbia University and St. Luke's-Roosevelt Hospital in New York.

He and James Gangwisch, a Columbia epidemiologist, led the study and are presenting results this week at a meeting of the North American Association for the Study of Obesity.

They used information on about 18,000 adults participating in the federal government's National Health and Nutrition Examination Survey, or NHANES, throughout the 1980s. The survey includes long-term follow-up information on health habits, and researchers adjusted it to take into account other things that affect the odds of obesity, like exercise habits, so that the effects of sleep could be isolated.

It seems "somewhat counterintuitive" that sleeping more would prevent obesity because people burn fewer calories when they're resting, Gangwisch said.

But they also eat when they're awake, and the effect of chronic sleep deprivation on the body's food-seeking circuitry is what specialists think may be making the difference in obesity risks.

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Related resource: Why Sleep Matters