冷空气可以帮助减肥

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　　WASHINGTON, Jan. 22 (Xinhua) -- Turning down temperatures at home and office may help you fight obesity¹, according to a new study published Wednesday in the U.S. journal Trends in Endocrinology & Metabolism².

　　New evidence suggests that regular exposure to mild cold may be a healthy and sustainable way to help people lose weight, researchers from Maastricht University Medical Center in The Netherlands said.

　　In other words, our warm and cozy³ homes and offices might be partly responsible for our expanding waistlines, they added.

　　"Since most of us are exposed to indoor conditions 90 percent of the time, it is worth exploring health aspects of ambient temperatures," first author Wouter van Marken Lichtenbelt of Maastricht University Medical Center said in a statement.

　　"What would it mean if we let our bodies work again to control body temperature? We hypothesize that the thermal⁴ environment affects human health and more specifically that frequent mild cold exposure can significantly affect our energy expenditure⁵ over sustained time periods."

　　Marken Lichtenbelt said they started studying the effects of mild cold about 10 years ago, mostly because it had received so little attention.

　　They found that a more variable indoor temperature, one that is allowed to drift along with temperatures outside, might be beneficial, although long-term effects still await further investigation⁶.

　　A previous study from researchers in Japan revealed a decrease in body fat after people spent 2 hours per day at 17 degrees Celsius⁷ for six weeks.

　　The new study also found that people get used to the cold over time. After six hours a day in the cold for a period of 10 days, people in the study increased heat-generating, calorie-burning brown fat, felt more comfortable and shivered less at 15 degree Celsius.

　　At least in young and middle-aged⁸ people, non-shivering heat production can account for a few percent up to 30 percent of the body's energy budget, they said. That means lower temperatures can significantly affect the amount of energy a person expends⁹ overall.

　　So perhaps, in addition to our exercise training, people need to train ourselves to spend more time in the cold, the researchers said.

　　Managing that in practice, however, might take some convincing. "Indoor temperature in most buildings is regulated to minimize the percentage of people dissatisfied," the researchers wrote.

　　"This results in relatively¹⁰ high indoor temperatures in wintertime. This is evident in offices, in dwellings¹¹ and is most pronounced in care centers and hospitals. By lack of exposure to a varied¹² ambient temperature, whole populations may be prone¹³ to develop diseases like obesity. In addition, people become vulnerable to sudden changes in ambient temperature."

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