Light might make you a lightweight—in a good way. It’s been known that bright light in the morning can reduce appetite and body weight. But that fact did not prove that light has a direct effect on weight. Early morning exposure to light could just be a marker for a regular sleep cycle, which is also associated with a healthy body weight.
阳光也许有助于塑造健美的身材呢!我们早就知道，沐浴清晨的阳光可以抑制你的食欲，减轻你的体重。但是我们尚不清楚阳光是否对体重有直接影响——不过，能够早起晒太阳的人，睡眠周期大都十分规律，而这也与健康的体重有关。
The question was thus whether light exposure was associated with weight regardless of sleep patterns.
那么，除去“睡得好”带来的影响，阳光与体重之间到底有没有直接的关系?
To find out, researchers had 54 adults record their diet and sleep for a week. The subjects also wore sensors that monitored the timing and intensity of their light exposure.
为了查明真相，研究人员记录了54位成年人一周内的饮食与睡眠情况。参与者同时佩戴了传感器,监测他们暴露在阳光中的时间与强度。
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. The study is in the journal PLOS ONE. [Kathryn J. Reid et al, Timing and Intensity of Light Correlate with Body Weight in Adults]
除去睡眠习惯的作用，参与者的体重与光线时间相对应——即使是昏暗的光线，其强度只有阴天阳光的一半。这项研究发表在《公共科学图书馆·综合》杂志上。[Kathryn J. Reid等人，光照时间和强度与成年人体重相关]
So early to bed and early to rise appears to indeed make you healthy. Jury's still out on whether it also makes you wealthy and wise.
所以早睡早起似乎确实让你更健康。至于它是否也能让你变得更富有、更聪明，目前还没有定论。
Light might make you a lightweight—in a good way. It’s been known that bright light in the morning can reduce appetite and body weight. But that fact did not prove that light has a direct effect on weight. Early morning exposure to light could just be a marker for a regular sleep cycle, which is also associated with a healthy body weight.
The question was thus whether light exposure was associated with weight regardless of sleep patterns.
To find out, researchers had 54 adults record their diet and sleep for a week. The subjects also wore sensors that monitored the timing and intensity of their light exposure.
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. The study is in the journal PLOS ONE. [Kathryn J. Reid et al, Timing and Intensity of Light Correlate with Body Weight in Adults]
So early to bed and early to rise appears to indeed make you healthy. Jury's still out on whether it also makes you wealthy and wise.
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