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Nightmare of Too Little Sleep: It is Tied to Too Much Weight
Nightmare of Too Little Sleep: It is Tied to Too Much Weight -- Posted by Gumbo on 11-28-04 19:36
Nightmare of Too Little Sleep: It is Tied to Too Much Weight
LAS VEGAS -- If you want to lose weight, get more sleep.
That's the message from a large study being released today. It confirms
earlier research suggesting that sleep deprivation promotes weight gain.
Researchers at Columbia University in New York looked back at sleep patterns
and obesity rates among participants in the government's National Health and
Nutrition Examination Survey from 1982-84 and then again in 1987. (More
recent surveys did not look at sleep patterns.)
They examined the records of 6,115 people, ages 32-59. Participants were
categorized by the amount of sleep they got each night. Those who slept for
seven to nine hours were considered normal sleepers. The researchers didn't
consider such factors as depression, physical activity and gender.
Among the findings being presented here at the annual meeting of the North
American Association for the Study of Obesity, in partnership with the
American Diabetes Association:
* People who sleep two to four hours a night are 73% more likely to be obese
than normal sleepers.
* Those who get five hours of sleep are 50% more likely to be obese.
* Those who sleep six hours were 23% more likely to be obese.
* Those who get 10 or more hours are 11% less likely to be obese.
''Getting more sleep actually had a protective effect against obesity,''
says lead researcher James E. Gangwisch. However, he points out that the
study does not ''prove cause and effect. It's an association.''
This research confirms other studies of children and adolescents that show
the same relationship between sleep and obesity, he says. Animal studies
also show that when rats are deprived of sleep, their appetites go way up.
Researcher have theorized that lack of sleep may affect several hormones
related to appetite and food intake, including leptin and ghrelin.
''Sleep deprivation activates a small part of the hypothalamus (region of
the brain) that is also involved in appetite regulation,'' says Eve Van
Cauter of the University of Chicago, one of the nation's leading sleep
researchers.
Her study in November's Journal of Clinical Endocrinology and Metabolism
shows that sleep duration has a major impact on leptin. When people are
sleep-deprived, their leptin levels are lower, which may cause the body to
crave more food, she says.
''It looks like weight control can be added to the long list of benefits of
getting adequate sleep,'' Gangwisch says.
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