是肥胖扰乱了瘦素的作用，还是瘦素信号失常导致人们变得肥胖？
Does obesity disrupt the action of leptin, or does a malfunction in leptin signaling make people obese?
Christakis表示同意，在一个特定的社会圈子中当超重和肥胖成为正常时，人们更可能变得肥胖。
Christakis agreed. When overweight or obesity becomes normal in a given social circle, people may be more likely to become obese themselves.
研究人员还不知道人们是否是因为缺乏棕色脂肪而导致局部肥胖的，还是其棕色脂肪在他们变得肥胖后才消失了。
Researchers don't know yet whether people become obese in part because they lack brown fat, or whether their brown fat stores go away after they become obese.
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