科学睡眠让你避免辛苦减肥

前者的内脏脂肪增加32%，在6至7小时之间的增加13%，不低于8小时的增加22%。
On average, short sleepers showed a 32 percent gain in visceral fat, versus a 13 percent gain among those who slept six or seven hours per night, and a 22 percent increase among men and women who got at least eight hours of sleep each night.皮下脂肪变化情形类似。
A similar pattern was seen with superficial abdominal fat.

美国北卡罗来纳州韦克福雷斯特大学医学院研究负责人克里斯滕·G·海尔斯通表示，该研究证实了睡眠习惯能够影响人们的体重和健康状况。“睡眠对你的身体健康很重要--并不仅在白天劳累的时候才有效。”她说。
The findings, according to lead researcher Dr. Kristen G. Hairston, of Wake Forest University School of Medicine in Winston-Salem, North Carolina, support the belief that sleep habits affect weight, and health in general. "Sleep is an important part of your overall health - not just in whether you’re tired during the day," she said.

关于睡眠时间关乎腹部脂肪增加，有很多理论基础。
As for why sleep duration might affect abdominal-fat gain, there are several theories.

首先，睡眠时间可能间接影响脂肪增加：睡眠少可能使人感到疲倦，导致日间无力锻炼身体；与睡眠时间居中者相比，睡眠较多者花在运动上的时间少一些，因而脂肪增加多一些。
There may be indirect effects; people who get too little sleep may be too tired during the day to exercise, while those who spend a lot of time in bed may spend less time being active, relative to people who sleep fewer hours.

其次，研究表明，睡眠少可能影响与食欲有关的荷尔蒙水平，导致过量饮食。
Research also suggests that sleep loss alters people’s levels of appetite-regulating hormones - which could, in theory, spur them to overeat.

再次，海尔斯通表示，心情抑郁也可能是一个原因：心情抑郁会影响人们的睡眠，抑郁本身与体重相关。但是，她和同事们没有研究对象抑郁症状的相关信息。
Depression, which often affects people’s sleep and has been linked to weight gain, could also be a factor, Hairston noted. She and her colleagues had no information on study participants’ depression symptoms.