Researchers at Brigham Young University in the journal Perspectives on
Psychological Science suggest that social isolation, whether real or
perceived, is associated with a higher risk for dying younger.
What are we going to do to prevent a loneliness epidemic in the near future?
http://www.ibtimes.com/loneliness-social-isolation-can-shorten-life-span-conditions-are-similar-obesity-1845040
Check out the book "Bowling Alone" published in 2000.