Why Loneliness Is A Growing Public Health Concern -- And What We Can Do About It
Article cites Prof. John Cacioppo, who theorizes loneliness may be a 'warning system' to enhance chances of survival, reproduction

Lessons from the science of loneliness
Prof. John Cacioppo discusses his finding that loneliness triggers a response of self-preservation in the brain
KPCC (Southern California Public Radio)
Britain has been voted the loneliness capital of Europe - so how did we become so isolated?
Article cites research by Prof. John Cacioppo, which concludes that loneliness in elderly people increases risk of heart attacks, dementia, high blood pressure, and other diseases
The Independent
Loneliness is deadly
Prof. John Cacioppo's research shows social isolation kills more people than obesity—and is just as stigmatized
Slate