?The associations we saw in our study between light exposure at night and obesity are very interesting.We cannot yet tell at this stage what the reason for the associations is,but the results open up an interesting direction for research,”said Prof.Anthony Swerdlow,from the Institute of Cancer Research.“One possible explanation is that the light is interrupting the body clock,which stems from our evolutionary past(进化历程).We were active when it was light in the day and restful when it was dark at night.”
Other research has found the effect of nighttime lighting on the body may contribute to unhappy feelings.But it’s too early to suggest that sleeping in the dark will help prevent obesity,a known risk factor for breast cancer.The findings are reported in the American Journal of Epidemiology.
Previous research has drawn similar conclusions.A team at Ohio State University examined how nighttime light affects weight,body fat and glucose intolerance(葡萄糖过敏) in mice.They found that continuing exposure to even a little nighttime light caused increases in all three aspects.
Light changes mood,physical strength and even the way we process food in a 24hour cycle.Artificial light is known to interrupt the body clock by delaying the production of the sleep hormone melatonin(睡眠荷尔蒙褪黑激素).So there is no harm in trying to make bedrooms darker.
5.What does the underlined part “piling on the pounds” in the first paragraph mean?
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