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Light might make you a light weight—in a good way.
只要方法得当，阳光也许会使你的体重减轻。
It's been known that bright light in the morning can reduce appetite and body weight.
现在经发现早上明亮的阳光可以减少食欲，减轻体重。
But that fact did not prove that light has a direct effect on weight.
但这并不代表说阳光对于体重减轻有直接作用。
Early morning exposure to light could just be a marker for a regular sleep cycle, which is also associated with a healthy body weight.
沐浴晨光只是证明睡眠规律正常，而这才与健康体重有直接关系。
The question was thus whether light exposure was associated with weight regardless of sleep patterns.
因此问题就是除去睡眠影响，阳光是否与体重有关系。
To find out, researchers had 54 adults record their diet and sleep for a week.
为了找寻答案，研究人员们记录了54名成年人为期一周的饮食和睡眠。
The subjects also wore sensors that monitored the timing and intensity of their light exposure.
这些人也戴上了传感器以检测进行日光照的时间和强度。
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.
除去睡眠习惯，受试者的体重与他们照射的日光有关—即便是微弱的光线，比如阴天只有一半强度的光线也依然有效。
The study is in the journal PLoS ONE.
这项研究已经在《公共科学图书馆》杂志上发表。
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.
不过这个习惯是否还能使你变得更富有和聪明可就不一定了。
