Loneliness and social isolation linked to fewer healthy years of life, study finds

A study published in Nature Communications examined data from more than 2.77 lakh adults in the UK to understand how loneliness and social isolation are linked to long-term health. The findings suggest that both experiences are associated with fewer years of life free from major physical diseases and mental health disorders, while a healthier lifestyle may help reduce some of the risks linked to social isolation.Social disconnection cuts healthy years, study findsNew Delhi,Oct 22, 2026 07:30 ISTLoneliness is not always visible. A person may live with family, go to work every day and interact with people regularly, yet feel emotionally disconnected. Another person may live alone or have limited social contact without necessarily feeling lonely. Although these experiences are related, they are not the same, and both may have implications for long-term health.A new study published in Nature Communications has examined the relationship between loneliness, social isolation and the number of years people can expect to live without major physical diseases or mental health disorders. Researchers analysed data from 277,489 adults in the UK Biobank who did not have the seven major chronic conditions examined at the beginning of the study.The findings showed that people who experienced both loneliness and social isolation had fewer expected years free from major diseases than those who experienced neither. The association was particularly strong for mental health disorders, including depression and anxiety. The researchers also found that a healthier lifestyle was associated with a smaller loss of disease-free life expectancy linked to social isolation, although the same pattern was not statistically significant for loneliness.WHAT IS THE DIFFERENCE BETWEEN LONELINESS AND SOCIAL ISOLATIONLoneliness is a person's subjective feeling of being alone or lacking meaningful relationships. It can occur even when someone has regular contact with friends, family or colleagues. Social isolation, on the other hand, refers to having fewer social connections or limited interaction with other people. The study assessed loneliness using questions about how often participants felt lonely and how frequently they could confide in someone close to them. Social isolation was assessed using information about living arrangements, visits with friends and family, and participation in social activities.Researchers grouped participants according to whether they experienced neither condition, loneliness alone, social isolation alone, or both.BOTH CONDITIONS WERE LINKED TO FEWER HEALTHY YEARS The researchers estimated how many years people at age 50 could expect to live without seven major chronic conditions. These included type 2 diabetes, cardiovascular disease, chronic respiratory disease, neurodegenerative disease, cancer, depression and anxiety.Women experiencing both loneliness and social isolation were estimated to live 3 years fewer without these conditions than women experiencing neither. Among men, the corresponding difference was 2.2 years.The researchers also examined physical diseases separately from mental health disorders. They found that loneliness and social isolation had a stronger association with the number of years lived free from mental health disorders than with the number of years lived free from physical diseases.For men experiencing both conditions, the estimated loss of years free from depression and anxiety was 5.8 years. For women experiencing both conditions, it was 3.7 years, compared with people who experienced neither.These figures are estimates based on population data. They do not predict exactly how long an individual will remain healthy, and the study does not establish that loneliness directly causes these outcomes.A HEALTHIER LIFESTYLE MAY HELP REDUCE SOME RISKSThe researchers also examined whether lifestyle habits were associated with the loss of disease free years linked to loneliness and social isolation. They considered five factors: smoking, body mass index, physical activity, diet and sleep duration.A healthier lifestyle was associated with more years free from major diseases in both people who experienced social isolation and those who did not. The difference in disease free life expectancy associated with social isolation also became smaller among people with healthier lifestyles.However, the researchers did not find a statistically significant reduction in the loss of disease free years associated with loneliness across healthier lifestyle groups. This suggests that lifestyle changes alone may not address every aspect of loneliness and its relationship with health.WHAT THE FINDINGS MEAN FOR PUBLIC HEALTHThe findings highlight the importance of considering social connections alongside other aspects of health. Regular physical activity, balanced eating, adequate sleep and avoiding smoking remain important lifestyle measures. Maintaining meaningful relationships and opportunities for social interaction may also be relevant to overall wellbeing.However, people who feel lonely should not be made to feel responsible for their health difficulties. Loneliness can be influenced by several factors, including life circumstances, bereavement, mobility, financial difficulties and access to social support.The study followed a large group of adults over time, but it has limitations. Loneliness and social isolation were assessed at the beginning of the study, so changes in participants' circumstances over the years could not be fully captured. The observational design also means the researchers cannot establish a direct cause and effect relationship.Overall, the findings suggest that loneliness and social isolation are important factors to consider when understanding healthy ageing. While healthier habits may help reduce some of the health disadvantages associated with social isolation, meaningful social connections and appropriate support may also be important parts of a broader approach to health.- Ends