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Light might make you a light weight—in a good way.
只要方法得當，陽光也許會使你的體重減輕。
It's been known that bright light in the morning can reduce appetite and body weight.
現在經發現早上明亮的陽光可以減少食欲，減輕體重。
But that fact did not prove that light has a direct effect on weight.
但這并不代表說陽光對于體重減輕有直接作用。
Early morning exposure to light could just be a marker for a regular sleep cycle, which is also associated with a healthy body weight.
沐浴晨光只是證明睡眠規律正常，而這才與健康體重有直接關系。
The question was thus whether light exposure was associated with weight regardless of sleep patterns.
因此問題就是除去睡眠影響，陽光是否與體重有關系。
To find out, researchers had 54 adults record their diet and sleep for a week.
為了找尋答案，研究人員們記錄了54名成年人為期一周的飲食和睡眠。
The subjects also wore sensors that monitored the timing and intensity of their light exposure.
這些人也戴上了傳感器以檢測進行日光照的時間和強度。
And independent of sleep habits, the participants' body weight corresponded to when they saw the light—even dim light, with just half the intensity of sunlight on a cloudy day.
除去睡眠習慣，受試者的體重與他們照射的日光有關—即便是微弱的光線，比如陰天只有一半強度的光線也依然有效。
The study is in the journal PLoS ONE.
這項研究已經在《公共科學圖書館》雜志上發表。
So early to bed and early to rise appears to indeed make you healthy.
所以早睡早起真的是有助于健康。
Jury's still out on whether it also makes you wealthy and wise.
不過這個習慣是否還能使你變得更富有和聰明可就不一定了。
