A late night not only creates dark circles under the eyes and a grumpy temper - it can causeweight gain too, according to a new study.
Scientists have discovered a lack of sleep can drastically slow the metabolism down which causes the body to use less energy for simple tasks like breathing and eating, after depriving male students of sleep.
The results,reported in the American Journal of Clinical Nutrition, add to evidence that sleep loss can promote weight gain - not just by boosting hunger but also by slowing the rate at which calories are burned.
The study suggests that getting plenty of sleep might prevent weight gain, said Christian Benedict of Uppsala University in Sweden, who led the study.
'Our findings show that one night of sleep deprivation acutely reduces energy expenditure in healthy men, which suggests sleep contributes to the acute regulation of daytime energy expenditure in humans,' he wrote.
A number of studies have observed that people who sleep five hours or less are more prone to weight gain and weigh-related diseases such as type-2 diabetes.
But those studies do not prove that sleep loss causes weight gain.
Experts said that factors such as lifestyle and diet might add to obesity risks and that it was not clear that sleep deprivation led to obesity.
Sanford Auerbach,head of the Sleep Disorders Center at Boston Medical Center, noted that sleep deprivation is a complex issue, with medication and other issues influencing sleep as well, and urged that the new findings be kept in context.
'They showed that we adapt to sleep deprivation and that some of these adaptations could theoretically contribute to obesity,' he said, adding that it's not clear how chronic sleep loss influences hormone levels.
The National Sleep Foundation recommends that adults get about seven to nine hours of sleep each night.
2011-05-23 17:07 编辑：juliatt
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