Cited by 6,043Health disparities and outcomesDeath Anxiety and Social ExclusionAging, Health, and Disability

Loneliness and Social Isolation as Risk Factors for Mortality: A Meta-Analytic Review

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Holt-Lunstad, Julianne, Smith, Timothy B., Baker, Mark, Harris, Tyler, Stephenson, David·2015·Perspectives on Psychological Science

Abstract

Actual and perceived social isolation are both associated with increased risk for early mortality. In this meta-analytic review, our objective is to establish the overall and relative magnitude of social isolation and loneliness and to examine possible moderators. We conducted a literature search of studies (January 1980 to February 2014) using MEDLINE, CINAHL, PsycINFO, Social Work Abstracts, and Google Scholar. The included studies provided quantitative data on mortality as affected by loneliness, social isolation, or living alone. Across studies in which several possible confounds were statistically controlled for, the weighted average effect sizes were as follows: social isolation odds ratio (OR) = 1.29, loneliness OR = 1.26, and living alone OR = 1.32, corresponding to an average of 29%, 26%, and 32% increased likelihood of mortality, respectively. We found no differences between measures of objective and subjective social isolation. Results remain consistent across gender, length of follow-up, and world region, but initial health status has an influence on the findings. Results also differ across participant age, with social deficits being more predictive of death in samples with an average age younger than 65 years. Overall, the influence of both objective and subjective social isolation on risk for mortality is comparable with well-established risk factors for mortality.

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  • Loneliness is a major detrimental factor for older adults' wellbeing, linked to poor mental health, quality of life, cognitive decline, and increased mortality.

    “Together with e.g. smoking and alcohol consumption, it has been shown to be a hugely detrimental factor, imposing threats leading to poor mental health, quality of life (Holt-Lunstad et al., 2015), declining cognitive function (Zhong et al., 2017) and increased mortality (Luo et al., 2012).”

    From Filial Piety, Generativity and Older Adults’ Wellbeing and Loneliness in Denmark and China (2022) · cites this paper as Holt-Lunstad et al., 2015

    The Introduction links social connectedness to psychological and emotional well-being, and Isolation and Aging reports a study linking loneliness after retirement to anxiety and depression. These passages support the mental-health portion, but our copy does not establish the claimed effect on quality of life. The cognitive-decline and mortality clauses are attached to different citations in the citing sentence. (LLM, conf=0.84)

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  • Social isolation is linked to poor health and low wellbeing.

    “Recent empirical evidence largely supports this view by documenting relationships linking social isolation, poor health, and low wellbeing (e.g., Larson, 1990; Holt-Lunstad et al., 2015; Liu et al., 2018).”

    From Emotional processes, collective behavior, and social movements: A meta-analytic review of collective effervescence outcomes during collective gatherings and demonstrations (2022) · cites this paper as Holt-Lunstad et al., 2015

    The Introduction links social isolation to poorer health behaviors and biological risk factors, and the Conclusion links it to poorer health and premature mortality (page numbers unavailable in our copy). These passages support the poor-health link, but they do not establish a relationship with low wellbeing. (LLM, conf=0.86)

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  • Loneliness and social isolation in young people contribute to psychological distress and increase risk of premature mortality, rivaling traditional risk factors.

    “The effects of loneliness and social isolation associated with being young can contribute to psychological distress, increasing risk of premature mortality, and such risk rivals that associated with traditional risk factors including smoking, obesity, excessive alcohol consumption and lack of physical activity.4 5”

    From Novel ACT-based eHealth psychoeducational intervention for students with mental distress: A study protocol for a mixed-methodology pilot trial (2019) · cites this paper as [4]

    The Conclusion (page not specified) reports that loneliness and social isolation are associated with premature mortality at a risk comparable to established factors, including obesity, physical inactivity and substance abuse. The Isolation and Aging section reports a stronger mortality association in adults under 65, particularly middle-aged adults, but does not establish the claim for young people specifically. The paper discusses psychological pathways but does not show that psychological distress mediates the mortality risk. (LLM, conf=0.87)

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  • Existing evidence indicates that loneliness and social isolation are independently associated with mental health conditions and mortality.

    “Although existing evidence indicates that loneliness and social isolation are independently associated with mental health conditions and mortality (Holt-Lunstad et al., 2015;Matthews et al., 2016), their independent effects on physical health conditions are less consistent and their independent effects on socioeconomic outcomes have not been investigated (Leigh-Hunt et al., 2017).”

    From Investigating the interplay of loneliness and social isolation across adolescence: Findings from a nationally representative longitudinal study (2026) · cites this paper as Holt-Lunstad et al., 2015

    The Discussion reports that loneliness and social isolation each predicted mortality after adjustment for covariates. The Introduction links a lack of social connections to psychological and emotional well-being, but the passages do not establish independent associations of loneliness and social isolation with mental health conditions; they also note that few studies examined the two concurrently. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Social isolation and loneliness have negative mental and physical health consequences.

    “Social isolation and loneliness have been studied extensively over the past four decades, with numerous studies showing that both have negative mental and physical health consequences [1–5].”

    From Examining social isolation and loneliness in combination in relation to social support and psychological distress using Canadian Longitudinal Study of Aging (CLSA) data (2020) · cites this paper as [3]

    The Introduction links both loneliness and social isolation to poorer health behaviors and biological risk factors, and the Conclusion links them to poorer health and premature mortality. The Introduction also says social connection benefits psychological and emotional well-being, but the paper does not directly establish negative mental-health consequences for both loneliness and social isolation. (LLM, conf=0.83)

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Cites

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1 of the 57 references couldn’t be matched to a known paper.

Research works printed but not linked: 8

  1. [1]1. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  2. [6]6. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  3. [15]15. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  4. [24]24. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  5. [33]33. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  6. [43]43. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  7. [52]52. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.
  8. [56]56. Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality: A meta-analytic review. Perspectives on Psychological Science, 10, 227-237.

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Authors
Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T., & Stephenson, D.
Affiliations
  • Department of Psychology
  • Brigham Young University (US)
Venue
Perspectives on Psychological Science
Published
2015-03
Volume
10
Issue
2
Pages
227-237
ISSN
  • 1745-6916 (ISSN-L)
  • 1745-6924
OpenAlex
W2165243546
Cited by
6,043
References
57
Citations by year
2026: 811 · 2025: 759 · 2024: 702 · 2023: 668 · 2022: 723 · 2021: 728 · 2020: 717 · 2019: 394 · 2018: 251 · 2017: 163 · 2016: 95 · 2015: 29
FWCI
222.69
Type
journal article
Language
en
Open access
Locations
  • Perspectives on Psychological Science (publishedVersion)
  • PubMed (publishedVersion)
  • ScholarsArchive (Brigham Young University) (submittedVersion)
Funders
Brigham Young University
Topics
  • Social Sciences › Health › Health disparities and outcomes
  • Social Sciences › Psychology › Social Psychology › Death Anxiety and Social Exclusion
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Aging, Health, and Disability
Keywords
loneliness, social isolation, mortality risk, living alone, objective social isolation, health risk factors, age differences, effect size comparison
MeSH terms
Humans, Loneliness, Mortality, Risk Factors, Social Isolation

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