Global study reveals fulfilling friendships boost health for 18,000 adults

A new global study shows that fulfilling friendships and close social relationships are strongly linked to better physical and mental health, according to research published in the Journal of Mental Health. The study, led by Dr. Maria Ruiz of the University of Barcelona, analyzed data from 18,000 adults across 22 countries, including the United States, Japan, and Brazil. It found that people who reported high-quality friendships had lower rates of chronic disease, better sleep, and fewer depressive symptoms than those with weaker social ties.

Why this matters is clear. In recent years, rates of social isolation have risen, especially after the COVID‑19 pandemic. Loneliness has been identified as a risk factor for heart disease, dementia, and early death. Previous studies have linked social connection to longevity, but they were often limited to single countries or small groups. This larger, cross‑cultural study confirms that the benefits of good friendships are universal, not just a Western phenomenon.

The research used a standardized survey that measured friendship quality, frequency of contact, and perceived support. Participants were asked how often they felt understood, how comfortable they were sharing worries, and how often they saw or talked to friends. Those in the top quartile of friendship quality were 30 percent less likely to report chronic conditions such as hypertension and arthritis. They also scored 15 percent higher on mental health scales, showing fewer symptoms of anxiety and depression. Dr. Ruiz noted that “the protective effect of friendships is comparable to that of regular exercise and healthy eating.”

Policy makers and health organisations can use these findings to design interventions that encourage social interaction. Some governments are already piloting community‑based programs that pair volunteers with older adults. Future research will look at how digital platforms can support meaningful friendships without replacing face‑to‑face contact. The study’s authors urge that public health campaigns treat strong friendships as a vital component of overall well‑being, just as diet and exercise are.