We've all heard the axiom "birds of a feather flock together," and the saying seems to be true for humans: we tend to associate with people that we resemble. Obviously, this kind of similarity can result from social influences, but can it also extend to our genes? A group of scientists attempts to answer this question in a new study in PNAS this week, but their findings have been met with a healthy dose of criticism.
Two long-term datasets were used as sources of data for this study, the National Longitudinal Study of Adolescent Health (known as Add Health), and the Framingham Heart Study Social Network (abbreviated as FHS-Net). These studies investigate some of the causes and risk factors associated with health, including social influences. Therefore, each of these studies asks respondents for information about some of their friends.
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