People with strong social relationships tend to live longer. A 2010 review of 148 studies, covering more than 300,000 people followed for seven and a half years on average, found that they had a 50 per cent greater likelihood of survival than people with weaker ties.
The review was led by the psychologist Julianne Holt-Lunstad and published in the journal PLOS Medicine. Researchers separate two ideas: social isolation means having few contacts, while loneliness is the painful feeling that your relationships fall short of what you need. Both are linked with poorer health. Friends and family may help by easing stress, encouraging healthier habits and noticing when something is wrong. Studies like these show a link rather than proof of cause, but the pattern has been found again and again. In 2023 the US Surgeon General, the country's leading public-health official, described loneliness as a public-health concern, and in June 2025 a World Health Organization commission estimated that loneliness is linked to about 871,000 deaths a year and affects one person in six worldwide.




