Objective:

To investigate the association between loneliness, social isolation, and years of life free of major chronic diseases.

Approach:

• Study Design: A prospective cohort study using UK Biobank data from 277,489 participants, assessing loneliness and social isolation at baseline.
• Outcome Measures: Primary outcome was life expectancy free of 7 major chronic diseases, with secondary analyses on lifestyle factors.
• Follow-up: Median follow-up of approximately 14 years for mortality and 13 years for chronic disease.

Key Findings:

• Women with loneliness had 3.9 fewer years free of depression and anxiety compared to 2.0 years for social isolation.
• Men with loneliness had 2.9 fewer years free of mental disorders, while social isolation was associated with 3.0 fewer years.
• Loneliness was linked to 1.5 years loss in physical disease-free life expectancy for women and 1.0 year for men.

Interpretation:

Loneliness and social isolation are associated with fewer years free of major chronic diseases, particularly affecting mental health.

Limitations:

• Loneliness and social isolation were assessed only at baseline, limiting the ability to track changes over time.
• Self-reported lifestyle factors may introduce bias.
• The study's observational nature prevents establishing causal relationships.

Conclusion:

Both loneliness and social isolation are linked to fewer years free of major chronic diseases, especially mental disorders.

Sources:

• Nature Communications