Not getting enough sleep at night could result in loosening the
ol' belt a couple of notches. This is because losing sleep
has been shown to raise levels of two hormones linked with appetite
and eating behavior. More specifically, lack of sleep reduces leptin,
a hormone that tells the brain there is no need for more food, and
increases ghrelin, a hormone that triggers hunger.
In one study, researchers found people
who received only four hours of sleep a night for two nights experienced:
- 18 percent reduction in leptin
- 28 percent increase in ghrelin
Also, the sleep-deprived subjects in the study seemed to eat more
sweet and starchy foods, rather than vegetables and dairy products.
Researchers suspected these cravings stemmed from the fact that
the brain is fueled by glucose (blood sugar); thus, when lack of
sleep occurs, the brain searches for carbohydrates.
In another study, researchers found that the less people slept,
the more they weighed (in regard to body mass index, which scales
weight to height). This study also revealed that people who slept
less had lower leptin levels and higher ghrelin levels. More specifically,
a:
- 16 percent reduction in leptin
- 15 percent increase in ghrelin
Yahoo!
News December 6, 2004
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