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Sleep Patterns Linked to
Diabetes Risk
posted May 5, 2005
Sleeping for less than six hours or
for more than nine hours each night is associated with an increased risk of
diabetes and impaired blood sugar (glucose) tolerance by 2.5-fold.
Lead author Dr. Daniel J. Gottlieb, stated that, "There are a lot of people who
sleep five or six hours per night who we generally think are not getting enough
sleep." His group hypothesized that people who do not get enough sleep may be at
increased risk of developing diabetes or impaired glucose tolerance.
Gottlieb, of Boston University School of Medicine, and colleagues enrolled 1,486
subjects, ages 53 to 93 years, in their study. The subjects completed
questionnaires regarding sleep patterns and underwent fasting glucose and
glucose tolerance testing.
Diabetes was present in 20.9 percent of subjects and impaired glucose tolerance
was present in another 28.2 percent. A usual sleep time of six hours or less was
reported by 27.1 percent, including 8.4 percent who reported five hours or less.
A total of 8.6 percent said that they slept for nine hours or more.
Compared with subjects who slept for seven to eight hours each night, the risk
of diabetes was increased by 2.5-fold in those sleeping five or less hours,
1.66-fold for those sleeping six hours, and 1.79-fold for those sleeping nine or
more hours. The corresponding increased risks of developing impaired glucose
tolerance were 1.33-, 1.58-, and 1.88-fold. Blood glucose levels were not
significantly affected by insomnia.
"These are strong associations suggesting that voluntary sleep restriction may
cause impaired glucose regulation," Gottlieb said. "Probably those sleeping nine
hours or more per night are doing so because of some underlying condition that
may not be diagnosed but that puts them at increased risk of diabetes," he
suggested.
The authors also noted that adequate levels of sleep should be tested as a
non-drug treatment strategy in patients with diabetes or impaired glucose
tolerance.
Sleeping for at least seven hours a night, Gottlieb concluded, "is a good health
practice for a variety of reasons, and this is one more reason."
Source: Diabetes In Control.com: Archives of Internal Medicine,
April 25, 2005.
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