Loneliness and social isolation may shave up to six healthy years from life expectancy

A large-scale analysis of over 270,000 people between 40 and 69 years old, published in Nature Communications, shows that loneliness and social isolation each cut roughly six years from a person’s disease-free lifespan. The study highlights that the reduction is more pronounced for mental-health conditions such as depression and anxiety than for physical ailments like diabetes or heart disease. Gender differences emerged: women’s mental health declines more sharply with loneliness, whereas men experience greater loss of mental-disorder-free years linked to social isolation.

At age 50, individuals facing both factors already have fewer years ahead free of chronic disease compared with those who are socially connected. While a healthy lifestyle can lessen some physical risks, it does not fully mitigate the adverse effects of loneliness. Lead author Lu Qi of Tulane University emphasized the need for targeted interventions to address these distinct social-health dynamics.