New evidence in economics and epidemiology seems to suggest that we care about other people’s weight as much as we do our own. It’s always more desirable to be slim – perhaps because it offers a better chance of finding a person to date or marry, or even faster job promotion. However, when the people we normally compare ourselves with become fatter, the cost of putting on weight for many of us reduces. Put simply, when other people around me become fatter, I don’t have to compete so much with them to stay slim.
經濟學和流行病學方面的新證據似乎表明，我們對他人體重的關注絲毫不亞于對自己體重的關注。人們總是更希望苗條一些——或許是因為這樣更容易找到約會或結婚的對象，甚至能更快地升遷。然而，對于我們許多人而言，如果我們常常拿來和自己做對比的人變胖了，我們自己體重增加的成本就會降低。簡言之，如果我身邊的人變胖了，那么我不用太費勁就能比他們苗條。
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