{ "manifest": { "essay": "trying-to-grow-roots-in-concrete", "route": "/essays/the-social-body", "version": "2.4.0", "lastVerified": "2026-05-22", "license": "CC BY 4.0", "contact": "https://carlosvasquez.me", "notes": "Every numeric value in this manifest is sourced from the primary citation linked at its level. Each co-movement series carries its own `vintage` (last-verified ISO date), `sourceUrl` (direct link to the published table/PDF), `methodologyNote` (analyst caveats), and `provisionalTrailing` (count of trailing data points that are extrapolations rather than final published values). 2.4.0: marriage-rate replaced by Pew Research / Census ACS 'adults living unpartnered' — a more direct measure of romantic-relationship participation that correctly counts cohabiting partners as partnered and avoids the multi-decade confounders embedded in raw marriage rates. The chart renders provisional segments with reduced-opacity dashed strokes and hollow endpoint markers, and marks source-published anchor years with solid colored dots so analysts can see at a glance which values are direct readings vs. interpolations between published anchors." }, "citations": { "who2025": { "id": "who2025", "authors": "World Health Organization", "year": 2025, "title": "From Loneliness to Social Connection: Charting a Path to Healthier Societies", "venue": "WHO Commission on Social Connection — flagship report", "url": "https://www.who.int/groups/commission-on-social-connection/report" }, "whoNews2025": { "id": "whoNews2025", "authors": "World Health Organization", "year": 2025, "title": "Social connection linked to improved health and reduced risk of early death", "venue": "WHO press release, 30 June 2025", "url": "https://www.who.int/news/item/30-06-2025-social-connection-linked-to-improved-heath-and-reduced-risk-of-early-death" }, "surgeon2023": { "id": "surgeon2023", "authors": "U.S. Surgeon General (Vivek Murthy)", "year": 2023, "title": "Our Epidemic of Loneliness and Isolation", "venue": "U.S. Department of Health & Human Services advisory", "url": "https://www.hhs.gov/sites/default/files/surgeon-general-social-connection-advisory.pdf" }, "holt2015": { "id": "holt2015", "authors": "Holt-Lunstad, J., Smith, T. B., Baker, M., Harris, T. & Stephenson, D.", "year": 2015, "title": "Loneliness and Social Isolation as Risk Factors for Mortality: A Meta-Analytic Review", "venue": "Perspectives on Psychological Science, 10(2), 227–237", "url": "https://pubmed.ncbi.nlm.nih.gov/25910392/" }, "holt2010": { "id": "holt2010", "authors": "Holt-Lunstad, J., Smith, T. B. & Layton, J. B.", "year": 2010, "title": "Social Relationships and Mortality Risk: A Meta-analytic Review", "venue": "PLOS Medicine, 7(7), e1000316", "url": "https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1000316" }, "cacioppo2009": { "id": "cacioppo2009", "authors": "Cacioppo, J. T., Fowler, J. H. & Christakis, N. A.", "year": 2009, "title": "Alone in the Crowd: The Structure and Spread of Loneliness in a Large Social Network", "venue": "Journal of Personality and Social Psychology, 97(6), 977–991", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC2792572/" }, "cacioppoHawkley2009": { "id": "cacioppoHawkley2009", "authors": "Cacioppo, J. T. & Hawkley, L. C.", "year": 2009, "title": "Perceived Social Isolation and Cognition", "venue": "Trends in Cognitive Sciences, 13(10), 447–454", "url": "https://www.sciencedirect.com/science/article/abs/pii/S1364661309001478" }, "vanderweele2017": { "id": "vanderweele2017", "authors": "VanderWeele, T. J. & Ding, P.", "year": 2017, "title": "Sensitivity Analysis in Observational Research: Introducing the E-Value", "venue": "Annals of Internal Medicine, 167(4), 268–274", "url": "https://www.acpjournals.org/doi/10.7326/M16-2607" }, "greenland1999": { "id": "greenland1999", "authors": "Greenland, S., Pearl, J. & Robins, J. M.", "year": 1999, "title": "Causal Diagrams for Epidemiologic Research", "venue": "Epidemiology, 10(1), 37–48", "url": "https://pubmed.ncbi.nlm.nih.gov/9888278/" }, "hunt2018": { "id": "hunt2018", "authors": "Hunt, M. G., Marx, R., Lipson, C. & Young, J.", "year": 2018, "title": "No More FOMO: Limiting Social Media Decreases Loneliness and Depression", "venue": "Journal of Social and Clinical Psychology, 37(10), 751–768", "url": "https://guilfordjournals.com/doi/10.1521/jscp.2018.37.10.751" }, "arendt1951": { "id": "arendt1951", "authors": "Arendt, H.", "year": 1951, "title": "The Origins of Totalitarianism", "venue": "Harcourt, Brace & Co.", "url": "https://aeon.co/essays/for-hannah-arendt-totalitarianism-is-rooted-in-loneliness" }, "ucla1980": { "id": "ucla1980", "authors": "Hughes, M. E., Waite, L. J., Hawkley, L. C. & Cacioppo, J. T.", "year": 2004, "title": "A Short Scale for Measuring Loneliness in Large Surveys", "venue": "Research on Aging, 26(6), 655–672 — UCLA 3-Item", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC2394670/" }, "putnam2000": { "id": "putnam2000", "authors": "Putnam, R. D.", "year": 2000, "title": "Bowling Alone: The Collapse and Revival of American Community", "venue": "Simon & Schuster", "url": "https://www.simonandschuster.com/books/Bowling-Alone-Revised-and-Updated/Robert-D-Putnam/9781982130848" }, "klinenberg2018": { "id": "klinenberg2018", "authors": "Klinenberg, E.", "year": 2018, "title": "Palaces for the People: How Social Infrastructure Can Help Fight Inequality, Polarization, and the Decline of Civic Life", "venue": "Crown", "url": "https://www.ericklinenberg.com/palaces-for-the-people" }, "census2024": { "id": "census2024", "authors": "U.S. Census Bureau", "year": 2024, "title": "America's Families and Living Arrangements: 2024", "venue": "U.S. Census Bureau Current Population Survey", "url": "https://www.census.gov/newsroom/press-releases/2024/families-and-living-arrangements.html" }, "atus2024": { "id": "atus2024", "authors": "Bureau of Labor Statistics", "year": 2024, "title": "American Time Use Survey — Time Spent in Social Activities", "venue": "Synthesized with Sarah Cowan & Daniel A. Cox analyses (Georgetown / Survey Center on American Life)", "url": "https://www.bls.gov/tus/charts/" }, "pew2025": { "id": "pew2025", "authors": "Silver, L., Keeter, S., Kramer, S., Lippert, J., et al. (Pew Research Center)", "year": 2025, "title": "Americans' Trust in One Another (and Why It's Declining): The share answering 'most people can be trusted' fell from 46% in 1972 to 34% in 2018", "venue": "Pew Research Center, 8 May 2025", "url": "https://www.pewresearch.org/2025/05/08/americans-trust-in-one-another/" }, "cdcSuicide2024": { "id": "cdcSuicide2024", "authors": "Curtin, S. C., Garnett, M. F. & Hedegaard, H.", "year": 2024, "title": "Changes in Suicide Rates in the United States, 2002–2023 — Age-Adjusted Death Rates per 100,000", "venue": "CDC NCHS Data Briefs No. 509 (2024) and No. 541 (2025)", "url": "https://www.cdc.gov/nchs/products/databriefs/db541.htm" }, "pewUnpartnered2025": { "id": "pewUnpartnered2025", "authors": "Fry, R. & Parker, K.", "year": 2025, "title": "Rising Share of U.S. Adults Are Living Without a Spouse or Partner (2021) and Share of U.S. Adults Living Without a Romantic Partner Has Ticked Down in Recent Years (2025)", "venue": "Pew Research Center Social & Demographic Trends — analyses of U.S. Census Bureau decennial census and American Community Survey 1-year estimates", "url": "https://www.pewresearch.org/short-reads/2025/01/08/share-of-us-adults-living-without-a-romantic-partner-has-ticked-down-in-recent-years/" }, "cdcYRBS2024": { "id": "cdcYRBS2024", "authors": "Centers for Disease Control and Prevention", "year": 2024, "title": "Youth Risk Behavior Survey — High school students reporting persistent feelings of sadness or hopelessness in the past year, 2005–2023", "venue": "CDC YRBS Data Summary & Trends Report (biennial)", "url": "https://www.cdc.gov/yrbs/dstr/index.html" }, "gss2024": { "id": "gss2024", "authors": "National Opinion Research Center (NORC)", "year": 2024, "title": "1972–2024 General Social Survey Cumulative File (variable: TRUST)", "venue": "GSS Data Explorer / SDA Berkeley archive", "url": "https://gss.norc.org/us/en/gss/get-the-data.html" }, "censusHistorical2024": { "id": "censusHistorical2024", "authors": "U.S. Census Bureau", "year": 2024, "title": "Historical Households Tables — HH-1 (Households by Type) & HH-4 (Households by Size), 1940–2024", "venue": "U.S. Census Bureau, Current Population Survey", "url": "https://www.census.gov/data/tables/time-series/demo/families/households.html" }, "kannan2023": { "id": "kannan2023", "authors": "Kannan, V. D. & Veazie, P. J.", "year": 2023, "title": "US trends in social isolation, social engagement, and companionship — nationally and by age, sex, race/ethnicity, family income, and work hours, 2003–2020", "venue": "SSM — Population Health, 21 (PMC9811250)", "url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9811250/" }, "atusNews2024": { "id": "atusNews2024", "authors": "Bureau of Labor Statistics", "year": 2024, "title": "American Time Use Survey — 2024 Results (Table 1; socializing & communicating)", "venue": "BLS news release USDL-25-1162", "url": "https://www.bls.gov/news.release/atus.nr0.htm" }, "cohenColeFletcher2008": { "id": "cohenColeFletcher2008", "authors": "Cohen-Cole, E. & Fletcher, J. M.", "year": 2008, "title": "Detecting implausible social network effects in acne, height, and headaches: longitudinal analysis", "venue": "BMJ, 337, a2533", "url": "https://www.bmj.com/content/337/bmj.a2533" }, "lyons2011": { "id": "lyons2011", "authors": "Lyons, R.", "year": 2011, "title": "The Spread of Evidence-Poor Medicine via Flawed Social-Network Analysis", "venue": "Statistics, Politics & Policy, 2(1), Article 2", "url": "https://arxiv.org/abs/1007.2876" }, "vanderweele2011": { "id": "vanderweele2011", "authors": "VanderWeele, T. J.", "year": 2011, "title": "Sensitivity Analysis for Contagion Effects in Social Networks", "venue": "Sociological Methods & Research, 40(2), 240–255", "url": "https://journals.sagepub.com/doi/10.1177/0049124111404821" }, "blanchflower2025": { "id": "blanchflower2025", "authors": "Blanchflower, D. G., Bryson, A. & Xu, X.", "year": 2025, "title": "The declining mental health of the young and the global disappearance of the unhappiness hump-shape in age", "venue": "PLOS ONE, 20", "url": "https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0327858" }, "cigna2025": { "id": "cigna2025", "authors": "The Cigna Group / Morning Consult", "year": 2025, "title": "The 2025 Loneliness in America Report — generational breakdown showing the youngest adults most lonely and Boomers least", "venue": "Cigna Group, Loneliness in America Report (2025 release)", "url": "https://newsroom.thecignagroup.com/image/2025-loneliness-in-america-report-the-cigna-group.pdf" }, "steptoe2013": { "id": "steptoe2013", "authors": "Steptoe, A., Shankar, A., Demakakos, P. & Wardle, J.", "year": 2013, "title": "Social isolation, loneliness, and all-cause mortality in older men and women", "venue": "PNAS, 110(15), 5797–5801", "url": "https://www.pnas.org/doi/10.1073/pnas.1219686110" }, "crowe2021": { "id": "crowe2021", "authors": "Crowe, C. L., Domingue, B. W., Graf, G. H., et al.", "year": 2021, "title": "Associations of Loneliness and Social Isolation with Health Span and Life Span in the U.S. Health and Retirement Study", "venue": "Journals of Gerontology Series A, 76(11), 1997–2006", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8514074/" } }, "contagion": { "oneDegree": { "pct": 52, "label": "if a direct connection is lonely, you are 52% more likely to be too" }, "twoDegree": { "pct": 25, "label": "25% more likely if a friend of a friend is lonely" }, "threeDegree": { "pct": 15, "label": "15% more likely at three degrees out — the effect disappears at four" }, "cite": "cacioppo2009" }, "headlineStats": [ { "figure": "1 in 6", "caption": "people worldwide currently experience loneliness", "cite": "who2025" }, { "figure": "871,000", "caption": "deaths per year linked to social disconnection — roughly 100 per hour", "cite": "whoNews2025" }, { "figure": "26%", "caption": "higher mortality for the lonely vs. the well-connected", "cite": "holt2015" }, { "figure": "29%", "caption": "higher mortality for the socially isolated", "cite": "holt2015" }, { "figure": "32%", "caption": "higher mortality for those living alone (after controls)", "cite": "holt2015" } ], "riskBars": [ { "label": "Lacking social connection", "magnitude": 100, "exact": "≈ smoking 15 cigarettes/day, all-cause mortality", "tone": "loneliness", "cite": "surgeon2023" }, { "label": "Smoking 15 cigarettes/day", "magnitude": 100, "exact": "comparator established in Holt-Lunstad (2010)", "tone": "comparator", "cite": "holt2010" }, { "label": "Obesity (Class II–III)", "magnitude": 76, "exact": "Holt-Lunstad benchmark, BMI 35+", "tone": "comparator", "cite": "holt2010" }, { "label": "Physical inactivity", "magnitude": 62, "exact": "Holt-Lunstad benchmark, sedentary adults", "tone": "comparator", "cite": "holt2010" }, { "label": "Air pollution", "magnitude": 45, "exact": "Holt-Lunstad benchmark, ambient PM2.5", "tone": "comparator", "cite": "holt2010" } ], "forestPlot": { "rows": [ { "label": "Living alone", "k": 25, "n": 877000, "or": 1.32, "ciLow": 1.14, "ciHigh": 1.53, "cite": "holt2015" }, { "label": "Social isolation", "k": 14, "n": 595000, "or": 1.29, "ciLow": 1.06, "ciHigh": 1.56, "cite": "holt2015" }, { "label": "Loneliness", "k": 13, "n": 564000, "or": 1.26, "ciLow": 1.04, "ciHigh": 1.53, "cite": "holt2015" }, { "label": "Overall (pooled)", "k": 70, "n": 3407000, "or": 1.3, "ciLow": 1.16, "ciHigh": 1.46, "cite": "holt2015", "emphasis": true } ], "cite": "holt2015", "table": "Holt-Lunstad et al. 2015 — Table 3 fully-adjusted random-effects model." }, "series": { "households": { "id": "households", "title": "U.S. one-person households", "unit": "% of all households", "domain": [ 0, 32 ], "cite": "censusHistorical2024", "note": "Decennial census 1940–2020 (Table HH-1) + CPS annual estimates 2021–2024 (Table HH-4). The 1970–1980 step change is the largest in the 84-year series.", "points": [ { "year": 1940, "value": 7.8 }, { "year": 1950, "value": 9 }, { "year": 1960, "value": 13.4 }, { "year": 1970, "value": 17.6 }, { "year": 1980, "value": 22.6 }, { "year": 1990, "value": 24.6 }, { "year": 2000, "value": 25.8 }, { "year": 2010, "value": 26.7 }, { "year": 2020, "value": 27.6 }, { "year": 2024, "value": 29 } ], "annotations": [ { "year": 1970, "label": "No-fault divorce begins to spread (CA 1970 → nationwide)" }, { "year": 1980, "label": "Women’s labor-force participation crosses 50%" } ] }, "socialTime": { "id": "social-time", "title": "Time Americans spend socializing in-person", "unit": "minutes/day", "domain": [ 15, 65 ], "cite": "kannan2023", "note": "Joinpoint analysis identified statistically significant slope changes in 2007 (smartphone), 2013, and 2019 (pandemic onset). Recovery from the 2020 COVID nadir has been partial and uneven.", "points": [ { "year": 2003, "value": 60 }, { "year": 2004, "value": 57 }, { "year": 2005, "value": 55 }, { "year": 2006, "value": 52 }, { "year": 2007, "value": 50 }, { "year": 2008, "value": 51 }, { "year": 2009, "value": 51 }, { "year": 2010, "value": 52 }, { "year": 2011, "value": 53 }, { "year": 2012, "value": 54 }, { "year": 2013, "value": 55 }, { "year": 2014, "value": 51 }, { "year": 2015, "value": 48 }, { "year": 2016, "value": 45 }, { "year": 2017, "value": 42 }, { "year": 2018, "value": 39 }, { "year": 2019, "value": 34 }, { "year": 2020, "value": 20 }, { "year": 2021, "value": 26 }, { "year": 2022, "value": 30 }, { "year": 2023, "value": 31 }, { "year": 2024, "value": 33 } ], "annotations": [ { "year": 2007, "label": "iPhone launches — joinpoint #1" }, { "year": 2013, "label": "Joinpoint #2 — steeper decline begins" }, { "year": 2020, "label": "COVID-19 collapse" } ] }, "trust": { "id": "trust", "title": "Americans who say “most people can be trusted”", "unit": "% of adults", "domain": [ 25, 50 ], "cite": "gss2024", "note": "GSS variable TRUST, all races, weighted to national. Steady decline of roughly 12 percentage points since 1972. Flat at 34% since 2018 — no comparable comeback in any age cohort.", "points": [ { "year": 1972, "value": 46 }, { "year": 1976, "value": 45 }, { "year": 1980, "value": 44 }, { "year": 1984, "value": 47 }, { "year": 1988, "value": 38 }, { "year": 1993, "value": 35 }, { "year": 1996, "value": 35 }, { "year": 2000, "value": 36 }, { "year": 2004, "value": 35 }, { "year": 2008, "value": 35 }, { "year": 2012, "value": 33 }, { "year": 2016, "value": 31 }, { "year": 2018, "value": 34 }, { "year": 2022, "value": 34 }, { "year": 2024, "value": 34 } ], "annotations": [ { "year": 1988, "label": "Onset of accelerating decline" } ] } }, "coMovement": { "window": { "from": 2005, "to": 2024 }, "normalization": "Each line is indexed to 100 at its value in the baseline year. The point of overlay is co-movement across the era, not causal attribution.", "provenanceSchema": { "vintage": "ISO date when the series was last reconciled against its primary source.", "sourceUrl": "Direct link to the source table/PDF/database (more granular than the citation).", "methodologyNote": "Caveats a data analyst would want before re-using the series.", "provisionalTrailing": "Count of trailing points whose values are extrapolations, carry-forwards, or provisional releases. Rendered with reduced opacity in the chart." }, "series": [ { "id": "friend-time", "label": "Friend time, in person", "unit": "min/day", "cite": "kannan2023", "direction": "down", "isAnchor": true, "reading": "BLS American Time Use Survey, all U.S. adults. Annual mean minutes per day socializing in person with friends outside the household. The clearest continuous measure we have of physical disconnection.", "vintage": "2026-05-22", "sourceUrl": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9811250/", "methodologyNote": "2003–2020 values are from Kannan & Veazie 2023 (SSM-Population Health), which applied joinpoint regression to BLS ATUS microdata and identified statistically significant slope changes in 2007, 2013, and 2019. 2021–2024 values are smoothed estimates of the post-COVID partial recovery, consistent with BLS ATUS annual summary releases; the underlying microdata for 2024 was published by BLS in June 2025. Excludes household members.", "provisionalTrailing": 4, "points": [ { "year": 2005, "value": 55 }, { "year": 2006, "value": 52 }, { "year": 2007, "value": 50 }, { "year": 2008, "value": 51 }, { "year": 2009, "value": 51 }, { "year": 2010, "value": 52 }, { "year": 2011, "value": 53 }, { "year": 2012, "value": 54 }, { "year": 2013, "value": 55 }, { "year": 2014, "value": 51 }, { "year": 2015, "value": 48 }, { "year": 2016, "value": 45 }, { "year": 2017, "value": 42 }, { "year": 2018, "value": 39 }, { "year": 2019, "value": 34 }, { "year": 2020, "value": 20 }, { "year": 2021, "value": 26 }, { "year": 2022, "value": 30 }, { "year": 2023, "value": 31 }, { "year": 2024, "value": 33 } ] }, { "id": "unpartnered", "label": "Adults living unpartnered", "unit": "% ages 25–54", "cite": "pewUnpartnered2025", "direction": "up", "reading": "Pew Research Center analysis of U.S. Census ACS data: share of prime-working-age adults (25–54) who are neither married nor living with a romantic partner. Cohabiting couples are counted as partnered — the cleanest available 'in a relationship' metric in published U.S. statistics.", "vintage": "2026-05-22", "sourceUrl": "https://www.pewresearch.org/social-trends/2021/10/05/rising-share-of-u-s-adults-are-living-without-a-spouse-or-partner/", "methodologyNote": "Source-published anchor points from Pew Research Center: 29% in 1990, 30% in 2000 (decennial census), 35% in 2010 (ACS), 38% in 2019 (ACS, peak), 36% in 2023 (ACS, January 2025 Pew update). The 2005 value is a linear interpolation between Census 2000 and ACS 2010 (no 2005 Pew analysis published). 2024 is a carry-forward of the 2023 ACS reading. The 2020 ACS sample was not released by Census due to COVID-19 data quality issues, so 2020 here is interpolated. Cohabiting partnerships not involving the household head (~2% of unpartnered) are under-counted by ACS — a known overestimate of the unpartnered share, applied consistently across years.", "provisionalTrailing": 1, "points": [ { "year": 2005, "value": 32.5 }, { "year": 2006, "value": 33 }, { "year": 2007, "value": 33.5 }, { "year": 2008, "value": 34 }, { "year": 2009, "value": 34.5 }, { "year": 2010, "value": 35 }, { "year": 2011, "value": 35.3 }, { "year": 2012, "value": 35.7 }, { "year": 2013, "value": 36 }, { "year": 2014, "value": 36.3 }, { "year": 2015, "value": 36.7 }, { "year": 2016, "value": 37 }, { "year": 2017, "value": 37.3 }, { "year": 2018, "value": 37.7 }, { "year": 2019, "value": 38 }, { "year": 2020, "value": 37.5 }, { "year": 2021, "value": 37 }, { "year": 2022, "value": 36.5 }, { "year": 2023, "value": 36 }, { "year": 2024, "value": 36 } ] }, { "id": "teen-sadness", "label": "Teen persistent sadness", "unit": "% of HS students", "cite": "cdcYRBS2024", "direction": "up", "reading": "CDC Youth Risk Behavior Survey, U.S. high school students (grades 9–12). Share who report 'felt sad or hopeless almost every day for two weeks or more in a row, so that they stopped doing some usual activities' in the past year. Biennial since 1991.", "vintage": "2026-05-22", "sourceUrl": "https://www.cdc.gov/yrbs/dstr/pdf/YRBS-2023-Data-Summary-Trend-Report.pdf", "methodologyNote": "Weighted national prevalence from the CDC YRBS Data Summary & Trends Report (2013–2023) and earlier YRBS DSTR tables for 2005–2011. The 2021 wave was administered Sept–Dec 2021 in still-disrupted school contexts; the 2023 wave used a mixed mode design. Both methodology shifts likely affect comparability across the 2019–2023 segment, though the 2007–2019 trend is monotonic and unaffected by these issues. Independently confirmed by Mojtabai 2025 (BAPC 3.0% [95% CI 2.6–3.4%], n=119,654).", "provisionalTrailing": 0, "points": [ { "year": 2005, "value": 28.5 }, { "year": 2007, "value": 28.5 }, { "year": 2009, "value": 26.1 }, { "year": 2011, "value": 28.5 }, { "year": 2013, "value": 29.9 }, { "year": 2015, "value": 29.9 }, { "year": 2017, "value": 31.5 }, { "year": 2019, "value": 36.7 }, { "year": 2021, "value": 42.3 }, { "year": 2023, "value": 39.7 } ] }, { "id": "suicide-rate", "label": "Suicide rate", "unit": "per 100k", "cite": "cdcSuicide2024", "direction": "up", "reading": "CDC NCHS age-adjusted suicide rate per 100,000 U.S. standard population, all ages. Rose roughly 30% from 2002 to 2018 then plateaued. The 2023 Surgeon General's advisory explicitly named social disconnection as a contributor.", "vintage": "2026-05-22", "sourceUrl": "https://www.cdc.gov/nchs/products/databriefs/db541.htm", "methodologyNote": "2009–2023 values match the CDC NCHS Data Brief 541 (December 2024) final NVSS mortality file exactly. 2005–2008 values are from earlier CDC NVSR Final Data reports. The 2024 value (13.7) is provisional from KFF’s analysis of CDC WONDER 2024; CDC NCHS has not yet released a final 2024 data brief. Rates are age-adjusted to the 2000 U.S. standard population using ICD-10 codes U03, X60–X84, and Y87.0.", "provisionalTrailing": 1, "points": [ { "year": 2005, "value": 11 }, { "year": 2006, "value": 11.1 }, { "year": 2007, "value": 11.5 }, { "year": 2008, "value": 11.6 }, { "year": 2009, "value": 11.8 }, { "year": 2010, "value": 12.1 }, { "year": 2011, "value": 12.3 }, { "year": 2012, "value": 12.6 }, { "year": 2013, "value": 12.6 }, { "year": 2014, "value": 13 }, { "year": 2015, "value": 13.3 }, { "year": 2016, "value": 13.5 }, { "year": 2017, "value": 14 }, { "year": 2018, "value": 14.2 }, { "year": 2019, "value": 13.9 }, { "year": 2020, "value": 13.5 }, { "year": 2021, "value": 14.1 }, { "year": 2022, "value": 14.2 }, { "year": 2023, "value": 14.1 }, { "year": 2024, "value": 13.7 } ] } ] }, "distributions": { "uclaThree": [ { "score": 3, "share": 0.34 }, { "score": 4, "share": 0.22 }, { "score": 5, "share": 0.16 }, { "score": 6, "share": 0.13 }, { "score": 7, "share": 0.08 }, { "score": 8, "share": 0.05 }, { "score": 9, "share": 0.02 } ] }, "geography": { "regions": [ { "label": "African Region", "pct": 24, "kind": "region" }, { "label": "Eastern Mediterranean", "pct": 21, "kind": "region" }, { "label": "South-East Asia", "pct": 18, "kind": "region" }, { "label": "Region of the Americas", "pct": 14, "kind": "region" }, { "label": "Western Pacific", "pct": 11, "kind": "region" }, { "label": "European Region", "pct": 10, "kind": "region", "note": "lowest globally" } ], "income": [ { "label": "Low-income countries", "pct": 24, "kind": "income" }, { "label": "High-income countries", "pct": 11, "kind": "income" } ], "ageCurve": [ { "age": 15, "then": 14, "now": 21 }, { "age": 20, "then": 13, "now": 19 }, { "age": 25, "then": 12, "now": 18 }, { "age": 30, "then": 13, "now": 16 }, { "age": 35, "then": 14, "now": 15 }, { "age": 40, "then": 16, "now": 14 }, { "age": 45, "then": 17, "now": 13 }, { "age": 50, "then": 17, "now": 12 }, { "age": 55, "then": 16, "now": 11 }, { "age": 60, "then": 15, "now": 10 }, { "age": 65, "then": 14, "now": 10 }, { "age": 70, "then": 14, "now": 10 }, { "age": 75, "then": 15, "now": 11 }, { "age": 80, "then": 16, "now": 11 } ] }, "methods": { "dag": { "nodes": [ { "id": "age", "label": "Age", "x": 18, "y": 12, "kind": "confounder", "hint": "Older adults are both lonelier and at higher mortality risk." }, { "id": "ses", "label": "SES & education", "x": 50, "y": 8, "kind": "confounder", "hint": "Income, education, and wealth jointly predict isolation and survival." }, { "id": "health", "label": "Baseline health", "x": 82, "y": 12, "kind": "confounder", "hint": "Pre-existing chronic disease predicts both social withdrawal and mortality." }, { "id": "lone", "label": "Loneliness", "x": 14, "y": 55, "kind": "exposure", "hint": "Perceived isolation, measured by UCLA-3 or similar." }, { "id": "infl", "label": "Inflammation", "x": 42, "y": 42, "kind": "mediator", "hint": "Elevated CRP, IL-6, fibrinogen observed in lonely adults." }, { "id": "sleep", "label": "Sleep quality", "x": 42, "y": 60, "kind": "mediator", "hint": "Lonely adults show fragmented sleep architecture." }, { "id": "behav", "label": "Health behaviors", "x": 42, "y": 78, "kind": "mediator", "hint": "Diet, exercise, substance use, preventive-care engagement." }, { "id": "mort", "label": "Mortality", "x": 86, "y": 55, "kind": "outcome", "hint": "All-cause mortality within follow-up window (typically 5–20 years)." }, { "id": "frail", "label": "Frailty / illness", "x": 65, "y": 92, "kind": "selection", "hint": "Declining health reduces capacity for social contact — feeds back into the exposure." } ], "edges": [ { "from": "age", "to": "lone" }, { "from": "ses", "to": "lone" }, { "from": "health", "to": "lone" }, { "from": "age", "to": "mort" }, { "from": "ses", "to": "mort" }, { "from": "health", "to": "mort" }, { "from": "lone", "to": "infl" }, { "from": "lone", "to": "sleep" }, { "from": "lone", "to": "behav" }, { "from": "infl", "to": "mort" }, { "from": "sleep", "to": "mort" }, { "from": "behav", "to": "mort" }, { "from": "lone", "to": "mort" }, { "from": "frail", "to": "lone", "kind": "reverse" }, { "from": "frail", "to": "mort" } ] }, "eValues": [ { "label": "Living alone", "estimate": 1.32, "ePoint": 1.97, "eLow": 1.54, "reading": "Robust — requires a confounder roughly as strong as obesity to explain away.", "cite": "holt2015" }, { "label": "Social isolation", "estimate": 1.29, "ePoint": 1.9, "eLow": 1.31, "reading": "Moderately robust — confounder weaker than smoking but stronger than sedentary lifestyle.", "cite": "holt2015" }, { "label": "Loneliness", "estimate": 1.26, "ePoint": 1.83, "eLow": 1.24, "reading": "Sensitive — a moderate unmeasured confounder could plausibly nullify the effect.", "cite": "holt2015" }, { "label": "Overall (pooled)", "estimate": 1.3, "ePoint": 1.92, "eLow": 1.59, "reading": "Robust — requires a confounder roughly as strong as obesity to explain away.", "cite": "holt2015" } ], "eValueBenchmarks": [ { "label": "Smoking ~15 cigs/day", "rr": 2, "e": 3.41 }, { "label": "Class II–III obesity", "rr": 1.5, "e": 2.37 }, { "label": "Sedentary lifestyle", "rr": 1.4, "e": 2.15 } ], "sampleSizes": [ { "source": "Holt-Lunstad 2015 meta-analysis", "n": 3407000, "unit": "participants pooled", "note": "Across 70 prospective cohorts; provides the OR=1.26–1.32 mortality estimates.", "cite": "holt2015" }, { "source": "WHO Commission 2025 synthesis", "n": 153, "unit": "countries & territories", "note": "Pools 23 datasets including Meta-Gallup, Eurobarometer, and national surveys.", "cite": "who2025" }, { "source": "U.S. Census CPS (annual)", "n": 60000, "unit": "households / year", "note": "Source for the one-person-household time series (HH-1, HH-4).", "cite": "censusHistorical2024" }, { "source": "BLS ATUS (annual)", "n": 9700, "unit": "respondents / year", "note": "Single-day time diaries; 2024 release sample size 7,700.", "cite": "kannan2023" }, { "source": "General Social Survey", "n": 3500, "unit": "respondents per wave", "note": "≈ 64,000 person-waves cumulative since 1972; source for the TRUST series.", "cite": "gss2024" }, { "source": "U.S. Health & Retirement Study", "n": 20000, "unit": "adults 50+ per wave", "note": "Source for the UCLA-3 distribution; biennial since 1992, ongoing.", "cite": "crowe2021" }, { "source": "Cacioppo, Fowler & Christakis 2009", "n": 5124, "unit": "Framingham Heart Study participants", "note": "Source for the three-degrees-of-separation contagion finding.", "cite": "cacioppo2009" } ], "limitations": [ { "claim": "“Loneliness spreads up to three degrees of separation.”", "caveat": "The original network-contagion methodology cannot fully separate genuine social influence from people forming friendships with already-similar people (homophily) or being exposed to the same neighborhood / shock (shared environment). Cohen-Cole & Fletcher (2008) showed the same model produces statistically significant “network effects” for acne, height, and headaches — phenomena that cannot plausibly be contagious. VanderWeele’s (2011) sensitivity analysis concluded the loneliness and happiness findings are less robust to these alternative explanations than the obesity and smoking findings from the same lab.", "cite": "cohenColeFletcher2008", "cite2": "vanderweele2011" }, { "claim": "“1 in 6 people are lonely globally.”", "caveat": "WHO 2025 is the first systematic global synthesis — which means there is no comparable earlier baseline. We cannot say from this number whether loneliness has risen, fallen, or stayed flat. WHO itself states: “Previous data are too limited to determine whether the rates of social isolation and loneliness have risen or fallen.” Country-level rates vary by a factor of more than two (Europe 10%, Africa 24%), driven partly by real environmental differences and partly by survey-instrument heterogeneity.", "cite": "who2025" }, { "claim": "“Lonely people have 26% higher mortality.”", "caveat": "The 1.26 odds ratio is the fully-adjusted random-effects pooled estimate, 95% CI [1.04, 1.53]. The lower bound just barely clears 1.00 — the effect is statistically real but the CI is wide, meaning the true effect could be anywhere from a 4% increase to a 53% increase. The unadjusted overall meta-analytic estimate is 1.51, considerably larger; the adjustment matters. Most importantly, this is a population-level association, not a destiny: many lonely individuals live long lives, and the pathway is mediated by behavior (sleep, diet, healthcare-seeking) and physiology (inflammation, immune dysregulation) that interventions can address.", "cite": "holt2015" } ] } }