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Social connections linked to longer, healthier lives
New research suggests robust relationships may influence health as profoundly as diet or physical activity, with global health bodies now treating social isolation as a critical public health issue.
Decades of research uncover surprising findings
The connection between social bonds and longevity traces back to a landmark 1960s study in California. Public health researcher Lester Breslow tracked nearly 7,000 residents of Alameda County, identifying seven key lifestyle factors-including exercise, sleep, and diet-that predicted longer lifespans. By 1979, his colleagues Lisa Berkman and S. Leonard Syme uncovered an eighth factor: social connection. Participants with the most relationships were about 50% less likely to die over the study period than those with fewer ties, even after accounting for other health behaviors.
How relationships affect physical health
Subsequent studies revealed social ties influence nearly every aspect of health. In the 1990s, psychologist Sheldon Cohen exposed volunteers to the common cold virus, finding those with diverse social networks were three to four times less likely to develop symptoms. Other research linked stronger relationships to lower risks of type 2 diabetes, Alzheimer's disease, and cardiovascular conditions. Loneliness, by contrast, increased the likelihood of heart attacks, strokes, and hypertension by roughly 30%.
"The size and quality of people's social relationships either equaled or surpassed nearly all other lifestyle factors in determining mortality," said Julianne Holt-Lunstad, a psychologist at Brigham Young University.
Julianne Holt-Lunstad, Brigham Young University
Evolutionary roots of social health
Scientists theorize humans evolved to treat social isolation as a life-threatening stressor. Early humans relied on group bonds for survival, and the brain may interpret loneliness as danger, triggering stress responses like inflammation and elevated blood clotting. While these reactions helped ancestors heal from injuries, chronic activation can damage modern health, increasing risks of heart disease, diabetes, and viral infections.
Criticism and counterarguments
Some skeptics argue observational studies cannot prove causation, as unmeasured factors might explain the link between relationships and health. However, Holt-Lunstad notes the findings meet key scientific criteria for causality, including consistency across populations and a dose-response relationship-where greater isolation correlates with worse outcomes. Parallel effects have been observed in social species like dolphins and primates, further supporting the pattern.
Practical steps to strengthen social health
Author David Robson, who explored the science in his book The Laws of Connection, emphasizes that social skills can be developed like muscles. Even introverts can cultivate meaningful connections by prioritizing interactions, nurturing existing relationships, and seeking new ones. The World Health Organization's new Commission on Social Connection underscores the urgency, framing social health as a global priority.
How to participate
The BBC is conducting an anonymous study on modern relationships. Participants can complete a short questionnaire to receive a personalized report and contribute to published findings later this year.
