A new study from Tulane University quantifies the physical and mental toll of loneliness and social isolation, finding that these conditions can reduce disease-free life expectancy by nearly six years. The research, published in Nature Communications, highlights how widespread these issues are in the United States, where about half of adults report feeling lonely or socially isolated.
Gender Differences in Health Loss
Researchers analyzed data from 277,489 adults aged 40 to 69 who did not have seven major chronic conditions at the start of the study. These conditions included diabetes, heart disease, lung disease, dementia, cancer, depression, and anxiety. Using age 50 as a baseline, the team calculated how many years participants could expect to live without these diseases based on their social connection levels.
The findings showed distinct gender differences. Women experiencing both loneliness and social isolation had 2.4 fewer years free from physical disease and 3.7 fewer years free from mental disorders compared to those with strong social ties. Men faced even steeper losses in mental health, with approximately 5.8 fewer years free from conditions like depression and anxiety. Men also had 1.7 fewer years free from physical disease.
Lead author Lu Qi, a professor at Tulane’s Celia Scott Weatherhead School of Public and Tropical Medicine, noted that men appear more susceptible to the health effects of loneliness. He also pointed out that women generally live longer than men, which may offer certain advantages regarding specific diseases.
Lifestyle Habits and Mental Health
The study also examined whether healthier lifestyle choices could mitigate these risks. Participants who maintained better diets, exercised regularly, got sufficient sleep, and avoided smoking saw a measurable reduction in the loss of disease-free years associated with social isolation. Social isolation refers to an objective lack of social connections, while loneliness is a subjective feeling of dissatisfaction with relationship quality.
However, a healthier lifestyle did not significantly reduce the additional health risks linked to feeling lonely. This distinction suggests that loneliness and social isolation may require different approaches to protect health. While building social networks might help those who are isolated, addressing the internal experience of loneliness may need separate interventions.
Qi stated that the findings were not surprising given previous research linking social isolation to premature mortality. This study provides additional evidence by quantifying the impact on disease-free life expectancy for both physical and mental health.
The research team plans to study additional population groups in the future. They also intend to use clinical trials to investigate whether loneliness and social isolation directly cause the health effects observed in this observational study.
Source: ScienceDaily
