How Does Sleep Loss Make You Fat?

Scientists claimed on Tuesday they had found evidence that losing sleep causes changes in brain activity that can lead to people feeling hungrier and craving more fattening foods.

Researchers have long pointed to a correlation between a steep rise in obesity in industrialised nations and a decline in sleep duration.

About Sleep Disorder
Sleep disorders can either be having difficulty in getting sleep or dozing off at inappropriate time.

A causal link was suspected, but science has not been able to explain the mechanism, until now.

A team from the University of California said they used MRI (magnetic resonance imaging) scans to spot changes in the brain activity of sleep-deprived test subjects.

"These findings provide an explanatory brain mechanism by which insufficient sleep may lead to the development/maintenance of obesity," they wrote in the journal Nature Communications.

About Sleep Disturbances
The physical, emotional and hormonal changes that occur in women during puberty, menstrual cycle, pregnancy, and menopause can cause Sleep Disturbances

Twenty-three participants had their heads scanned twice; once after a full night of sleep and once after being deprived their shut-eye for a night -- their brain activity measured the next day as they selected items and portion sizes from pictures of 80 different food types.

Among the fatigued individuals, the researchers noted impaired activity in regions of the cortex that evaluate appetite and satiation. Simultaneously, there was a boost in areas associated with craving.

Sleep Disorders in Children - Overview, Types, Diagnosis, Management
Sleep disorders are problems in sleep that meet diagnostic criteria for a disorder. They include insomnia, obstructive sleep apnea, parasomnias and narcolepsy.

"An additionally interesting finding was that high calorie foods became more desirable to the sleep deprived participants," said study co-author Matthew Walker of the psychology department at the University of California in Berkeley.

"These findings of impaired brain activity in regions that control good judgement and decision making together with amplified activity in more reward-related brain regions fit well with, and potentially explain, the link between sleep loss, weight gain and obesity," he told AFP by email.

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Obstructive sleep apnea should be suspected in overweight middle aged adults who snore loudly and which can cause interruption of breathing for 10 seconds or more and this results in reduced blood o

"Our findings indicate that (to) regularly obtain sufficient amounts of sleep may be an important factor promoting weight control, achieved by priming the brain mechanisms governing appropriate food choices."

According to the World Health Organisation, more than 1.4 billion adults aged 20 and older were overweight in 2008 -- a figure that had nearly doubled since 1980.

More than a third of adults were overweight in 2008, and 11 percent obese, and at least 2.8 million adults die every year as a result.

Source-AFP