Social connection: isolation is not loneliness

Weaker contact with other people is associated with a higher risk of dying. Isolation and loneliness are two different pools.

Where you stand

This slider is how often there is meaningful contact, which is closer to isolation than to loneliness. The three-level table is this calculator's construction; no paper reports it.

Each row is one study of death risk from social connection. The bright line is what that study found. The band around it is the range the data still supports — it fades where the evidence thins. Left of the centre line is lower risk.

what the study foundstill plausibleno change

highest vs lowest social isolation

Naito et al. 2023

33% higher

range 26–41% higher

loneliness vs no loneliness (pooled, both genders)

Rico-Uribe et al. 2018

22% higher

range 10–35% higher

loneliness vs no loneliness (older adults, pooled)

Zhou et al. 2023

9% higher

range 6–12% higher

What it is

How often there is meaningful contact with other people. That is closer to isolation than to loneliness. The three-level table is this calculator’s construction; no paper reports it.

How it is modeled (not scored)

Technical notes

The curve is constructed: Strong = 0.85, Average = 1.0, Weak = 1.25. No paper reports that three-level table. Wang 2023 (90 cohorts, 2,205,199 people) is the matching-construct split meta: isolation all-cause mortality 1.32 (1.26–1.39), I² 77.8%; loneliness 1.14 (1.08–1.20), I² 91.1% — two separate pools. Combined isolation+loneliness 1.18, smaller than isolation alone. Weak 1.25 is milder than Wang’s isolated-vs-not 1.32; 0.85 is not 1/1.32. Holt-Lunstad 2015 is three separate ORs (isolation 1.29, loneliness 1.26, living alone 1.32), not HRs, not a joint model. Naito 2023 isolation-only HR 1.33. Nakou 2025 older-adult isolation 1.35 / loneliness 1.14 / living-alone 1.21.

How to improve it

Schedule regular contact with close friends/family
Join a group around a shared interest
Prioritize a few deep ties over many shallow ones

What the studies found

Endpoint	Grade	Finding
—	METHOD	0.85 / 1.0 / 1.25 is constructed Strong / Average / Weak contact frequency. Average = 1.0 is the typical. Weak 1.25 is milder than Wang’s isolation 1.32. 0.85 is not 1/1.32.
All-cause mortality	C	Isolation 1.32, loneliness 1.14 — two pools (Wang 2023) Technical notes 90-cohort all-cause mortality split: isolation 1.32 (1.26–1.39), loneliness 1.14 (1.08–1.20). Combined 1.18, not stacked. Holt-Lunstad’s 1.29 / 1.26 / 1.32 are ORs for three separate pools, not this curve.
All-cause mortality	C	1.35 in Older Adults, Still Not 1.25 (Nakou 2025) Technical notes 86-study older-adult meta (65+): isolation all-cause mortality HR 1.35 (1.27–1.43); loneliness 1.14 (1.10–1.18); living alone 1.21 (1.13–1.30) — three separate constructs, not one model. Isolation’s 1.35 is the closest age-matched analogue to this slider’s Weak-contact penalty, still not the curve’s constructed 1.25.
All-cause mortality	C	The Original Three: 1.29 / 1.26 / 1.32 (Holt-Lunstad 2015) Technical notes Classic meta of 70 independent prospective studies (3,407,134 people, mean follow-up 7 years) pooled three separate constructs as odds ratios, not hazard ratios: isolation OR 1.29, loneliness OR 1.26, living alone OR 1.32 — three distinct models, not one joint estimate, comparable in size to well-established risk factors.
All-cause mortality	C	Loneliness Alone, HR 1.22 (Rico-Uribe 2018) Technical notes Loneliness-specific meta of 35 articles (77,220 people): pooled all-cause mortality HR was 1.22 (1.10–1.35) for both genders. Isolation was not assessed in this pooling, so it cannot be compared to Wang’s separate isolation estimate.
All-cause mortality	C	Older-Adult Loneliness Is Smaller, HR 1.09 (Zhou 2023) Technical notes Older-adult loneliness meta of 36 studies (128,927 people): pooled all-cause mortality HR was a modest 1.09 (1.06–1.12), though older men alone carried a higher HR 1.18 (1.04–1.33) — smaller than Nakou’s mixed-age older-adult loneliness pool of 1.14.

What argues against this

No source in this metric's set contradicts the direction of the association — every pooled estimate here says weaker social connection carries higher all-cause mortality. The strongest disagreement is on magnitude: Zhou et al. 2023's older-adult loneliness meta (36 studies, 128,927 people) found a much smaller pooled HR of 1.09 (1.06–1.12) than Nakou's mixed-age older-adult loneliness pool (1.14) or the curve's constructed Weak-tier penalty of 1.25 — suggesting that if 'weak social contact' resembles loneliness more than isolation, the curve's 1.25 may overstate the true risk.

Last reviewed 12 October 2026

Sources

6 cited

Wang et al. (2023) — Nature Human Behaviour
A systematic review and meta-analysis of 90 cohort studies of social isolation, loneliness and mortality
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Holt-Lunstad et al. (2015) — Perspectives on Psychological Science
Loneliness and Social Isolation as Risk Factors for Mortality: A Meta-Analytic Review
View source
Naito et al. (2023) — PLOS ONE
Social isolation as a risk factor for all-cause mortality: Systematic review and meta-analysis of cohort studies
View source
Nakou et al. (2025) — Aging Clinical and Experimental Research
Loneliness, social isolation, and living alone: a comprehensive systematic review, meta-analysis, and meta-regression of mortality risks in older adults
View source
Rico-Uribe et al. (2018) — PLOS ONE
Association of loneliness with all-cause mortality: A meta-analysis
View source
Zhou et al. (2023) — Psychiatry Research
A meta-analysis of the association between loneliness and all-cause mortality in older adults
View source

Not part of your score

Social Connection is tracked here for its research. It does not count toward the 8-marker MarkerScore. See what does in the calculator.

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Educational content only — not medical advice, diagnosis, or treatment. Not a medical device; not FDA evaluated. Consult a qualified healthcare professional about your own health, and call emergency services for urgent symptoms. Full medical disclaimer →