I leave you with one final thought: in the real world two people are influencing each other continuously, trying to live up (or down) to each other's expectations.
最后还有一个问题：在现实中两个人是持续地互相影响的，都会试图去迎合对方的期待。
Friend selection matters too: Maybe overweight people seek each other and cluster together rather than directly influencing one another's behavior.
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。
Influencing people --- Being in a position to influence the attitudes or opinions of other people .
影响别人--- 喜欢在一个需要改变或影响别人态度观点的职位上工作。
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