Prof Anthony Swerdlow of the Institute of Cancer Research told the BBC：“In this very large group of people there is an association between reported light exposure at night and overweight and obesity.But there is not enough evidence to know if making your room darker would make any difference to your weight.There might be other explanations for the association，but the findings are interesting enough to guarantee further scientific investigation.”

　　The light is disrupting (干扰) the body clock，which comes from our evolutionary (进化的) past when we were active when it was light in the day and resting when it was dark at night.Light changes moods，physical strength and even the way we process food in a 24­hour cycle.

　　Prof Derk­Jan Dijk，from the Surrey Sleep Centre，said there would be no harm in trying to make bedrooms darker.He told the BBC：“People in general are not aware of the light present in their bedroom，I think people should assess their bedroom and see how easy it would be to make it darker.” “Overall this study points to the importance of darkness，” he concluded.

　　【语篇解读】　明亮的卧室与肥胖有关系。

　　1．What does the passage mainly talk about?

　　A．People should buy thicker curtains.

　　B．Light bedrooms are linked to obesity.

　　C．People should turn off lights.

　　D．Dark bedrooms are linked to obesity.

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