例如，瘦人与超重者相比有更多可检测的棕色脂肪。
For example, leaner people have more detectable brown fat than overweight people.
择友也会有影响：可能超重者互相寻找并聚在一起，而不是直接相互影响对方行为。
Friend selection matters too: Maybe overweight people seek each other and cluster together rather than directly influencing one another's behavior.
由于研究采用了BMI数据，它没有将高个子(因此体重高于平均值)与超重者相混淆。
Because the research used BMI data, it has not confused taller (and therefore heavier than average) people with those who are overweight.
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