Ever feel lonely in a crowd?  Sure, we all have. Turns out, researchers have discovered you may be spreading that lonely feeling.

By Elizabeth Landau, CNN

John Cacioppo, a psychologist at the University of Chicago who has written a book called “Loneliness,” teamed up with Christakis and Fowler to study the effect of this phenomenon in social networks.

The authors focused on data from the Framingham Heart Study, which has followed thousands of people in Framingham, Massachusetts, since 1948. The loneliness research looked at the second generation in the study, which includes 5,124 people.

In the heart study, researchers kept in touch with participants every two to four years, asking them about depression, loneliness and other issues. They also kept a record of their friends. This allowed Christakis, Fowler and Cacioppo to look at the subjects’ social networks over time.

If a direct connection in your social network is lonely, you are 52 percent more likely to be lonely, the researchers found. At two degrees of separation — a friend of a friend — it’s 25 percent. At three degrees, someone who knows your friend’s friend, it’s 15 percent.

By helping lonely people on the periphery of a social network, “We can create a protective barrier against loneliness that will keep the whole network from unraveling,” Christakis and Fowler wrote in “Connected.”

The results are surprising because “we think of loneliness as something that affects a person who is by himself or herself,” Ed Diener, professor of psychology at the University of Illinois at Urbana-Champaign, said in an e-mail. He was not involved in the study.

But it makes sense that the way a lonely person behaves could influence others, and those people could respond in kind to more friends, social scientists say.

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