不大充足 时尚双语:睡眠充足有利于保持好身材

时尚双语:睡眠充足有利于保持好身材  

An extra hour beeen the sheets at night might be the key to shedding excess weight and fighting obesity
according to recent research.
"More sleep could be the ideal way of stabilising weight or slimming
" said neuro-scientist Karine Spiegel
of France's INSERM
a public anisation dedicated to biological
medical and public Health research.
While poor eating habits and lack of exercise clearly play a role in the global rise of obesity
recent data indicates that lack of sleep may also be a factor
and one that is often under-estimated.
Around 30 surveys carried out on wide population samples in seven countries have underlined a link beeen lack of sleep and excess weight or obesity in both children and adults
Spiegel said.
The first of the studies
carried out in 1992 in France
highlighted the problem in children and teenagers. Spiegel said the increase in obesity in the US in the second half of the 20th century corresponded with a mounting decrease in sleep.
Two key hormones produced at night which help regulate appetite were at play
she said.
Grehlin makes people hungry
slows metabolism and decreases the body's ability to burn body fat
and leptin
a protein hormone produced by fatty tissue
regulates fat storage.
"We have shown that less sleep (o four-hour nights) caused an 18 percent loss of appetite-cutting leptin and a 28 percent increase of appetite-causing grehlin
" she said.
Such hormonal changes made people hungry for foods heavy in fats and sugars such as chips
biscuits
cakes and peanuts
she added.
The sleep loss caused a 23 to 24 percent increase in hunger
Spiegel said
translating into an extra 350 to 500 kilocalories a day
"which for a young sedentary adult of normal weight could lead to a major amount of added weight."
It was unclear whether several years of sleep deprivation could lastingly harm the body's ability to restore a balance beeen the o hormones.
A study released in Washington in February showed children lacking shut-eye faced a greater risk of being obese than kids who got a good night's sleep.
Each extra hour of sleep cuts a child's risk of being overweight or obese by nine percent
according to an analysis of epidemiological studies by researchers from Johns Hopkins Bloomberg School of Public Health.
By contrast
children who got the least sleep had a 92 percent higher chance of being overweight or obese than children who slept enough
said the study published in the journal Obesity.
"Our analysis of the data shows a clear association beeen sleep duration and the risk for overweight or obesity in children. The risk declined with more sleep
" said Youfa Wang
a senior author of the study.
"Desirable sleep behavior may be an important low cost means for preventing childhood obesity and should be considered in future intervention studies
" Wang said in a news release.
The researchers reviewed 17 published studies on sleep duration and childhood obesity.
Some research remends that children under five years old sleep 11 hours or more a day
while children age five to 10 should get 10 or more hours of sleep
and children older than 10 should sleep at least nine hours.
（Agencies）
Vocabulary:
metabolism：新陈代谢