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Depression Not Contagious, But Happiness Spreads
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Depression Not Contagious, But Happiness Spreads

Researchers at Coventry University, England, found that while depression does not spread among friends, happiness is contagious and may be the key to treating and preventing depression.
Parents have long been wary of friends who have a bad influence on their children. Using a mathematical model to study teenagers’ influence on each other, researchers found they can affect each other positively.
“We’ve found that a healthy mood amongst friends is linked with a significantly reduced risk of developing, and increased chance of recovering from, depression,” said Frances Griffiths, a professor at the University of Warwick, reports upi.com
“Our results offer implications for improving adolescent mood. In particular they suggest the hypothesis that encouraging friendship networks between adolescents could reduce both the incidence and prevalence of depression among teenagers.”
Researchers gathered data from The National Longitudinal Study of Adolescent to Adult Health on the moods of 2,194 teenagers in 7th through 12th grade during the 1994-1995 school year. The participants of the NLSAAH were followed periodically throughout their lives, most recently in 2008.
Researchers, who conducted the new study, used mathematical models similar to those used to track disease epidemics to follow the way teenagers’ moods spread among groups of friends.
In addition to finding that depression does not spread through friends, healthy moods do spread and were shown to cut the probability of developing depression in half and double the probability of recovering from depression in a 6 to 12-month period. Based on the model, data showed that having 5 mentally healthy friends cut the chances of developing depression in half. Teenagers with 10 healthy friends had double the chances of recovering from depression as those who had only 3 friends, researchers said.
“It could be that having a stronger social network is an effective way to treat depression,” said Dr. Thomas House, a senior lecturer at the University of Manchester. “More work needs to be done but it may be that we could significantly reduce the burden of depression through cheap, low-risk social interventions. As a society, if we enable friendships to develop among adolescents (for example providing youth clubs) each adolescent is more likely to have enough friends with healthy mood to have a protective effect.”

 

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