THE HILL:

Everyone feels isolated sometimes, but with one in five Americans chronically lonely, has loneliness reached epidemic proportions? In 1988, the journal Science published a landmark study suggesting isolation was as strong a risk factor for morbidity and mortality as sedentary lifestyle, high blood pressure and smoking or obesity. Since then, loneliness has become an increasing public health concern and health officials are now taking the idea of an epidemic seriously. As the population ages, the burden of social isolation on public health will only increase.

Loneliness is one aspect of interrelated conditions such as isolation due to illness, disability or age; the social and language-based isolation of being an immigrant; depression; poverty; discrimination, etc.

This past summer, two surveys made news, marking the extent of loneliness in the U.S. and other economically developed countries. Since these and other studies are new, we can anticipate learning more about the interrelationships of factors that contribute to loneliness over time. That shouldn’t stop us from addressing the problem now, but may help provide better perspective.

The most recent survey, from The Economist and the Kaiser Family Foundation, finds that 9 percent of adults in Japan, 22 percent in America and 23 percent in Britain “always” or “often” feel lonely or lack companionship. Another study of 20,000 U.S. adults, 18 and older, published in May by Cigna and market research firm Ipsos, reveals nearly half of American adults reported “sometimes” or “always” feeling alone (46 percent) or left out (47 percent); more than one in four Americans (27 percent) “rarely” or “never” feel that people understand them; and 43 percent of Americans “sometimes” or “always” feel their relationships lack meaning and they are isolated. One finding stands out: Generation Z (22 years and younger) scored the lowest of every age-group and appears to be more prone to experiencing significant loneliness. Gen Z may be the loneliest generation.

Regarding health impacts, several recent studies have found that loneliness is a risk factor for decreased resistance to infection, cognitive decline and conditions such as depression and dementia.

A UC San Francisco 2010 study found loneliness to be a predictor of functional decline and death among adults 60 and older. Over six years, lonely subjects were more likely to experience decline in activities of daily living (24.8 percent vs. 12.5 percent); develop difficulties with upper extremity tasks (41.5 percent vs. 28.3 percent); experience decline in mobility (38.1 percent vs. 29.4 percent) or climbing (40.8 percent vs. 27.9 percent); and face increased risk of death (22.8 percent vs. 14.2 percent). It appears that without social interaction, we languish and decline, though it’s possible that greater longevity, coupled with functional decline, leads to social isolation.

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