Do We Choose Our Friends Because They Share Our Genes?

Rob Stein at NPR: “People often talk about how their friends feel like family. Well, there’s some new research out that suggests there’s more to that than just a feeling. People appear to be more like their friends genetically than they are to strangers, the research found.
“The striking thing here is that friends are actually significantly more similar to one another than we were expecting,” says  James Fowler, a professor of medical genetics at the University of California, San Diego, who conducted the study with Nicholas A. Christakis, a social scientist at Yale University.
In fact, the study in Monday’s issue of the Proceedings of the National Academy of Sciences found that friends are as genetically similar as fourth cousins.
“It’s as if they shared a great- great- great-grandparent in common,” Fowler told Shots.
Some of the genes that friends were most likely to have in common involve smell. “We tend to smell things the same way that our friends do,” Fowler says. The study involved nearly 2,000 adults.
This suggests that as humans evolved, the ability to tolerate and be drawn to certain smells may have influenced where people hung out. Today we might call this the Starbucks effect.
“You may really love the smell of coffee. And you’re drawn to a place where other people have been drawn to who also love the smell of coffee,” Fowler says. “And so that might be the opportunity space for you to make friends. You’re all there together because you love coffee and you make friends because you all love coffee.”…”