Research
Everything the Center has published, most recent first. 258 items.
27 March 2025
National loneliness statistics vary by a factor of two depending on the instrument used. That variation is not noise to be averaged away -- it defines the limits of what the numbers can justify in policy.
19 March 2025
Across national and global surveys, adults under 30 consistently report more loneliness than adults over 65. The pattern is robust; the explanation for it is not settled.
9 March 2025
Surveys consistently put young adults at the top of loneliness rankings, but the same age group is often the least structurally isolated. The literature treats these as one problem, and that conflation has consequences for what gets funded.
7 March 2025
A 2010 meta-analysis put the survival benefit of strong relationships at 50%; a 2022 cardiovascular statement put the isolation risk at roughly 30%. The numbers are not in conflict once the outcomes, populations, and estimands are made explicit.
24 February 2025
Gallup's global data and the AARP survey both find loneliness lowest among people 65 and older, the opposite of what most policy narratives assume. The pattern holds, but isolation does not follow the same curve.
20 February 2025
The literature on loneliness and mortality has moved past whether an association exists. What varies enormously, and matters more for policy, is the size of that association across studies.
9 February 2025
Five years of reviews agree that loneliness and isolation raise mortality and cardiovascular risk. None of them can point to a strong trial base showing what actually reduces that risk.
30 January 2025
Social prescribing is now government policy in the UK and spreading elsewhere, but the trial evidence behind it remains thin. A review of what the systematic reviews actually find.
27 January 2025
The proposed biological pathway from loneliness to cardiovascular disease rests on decades of correlational data and almost no interventional evidence. A look at what would actually test the mechanism.
25 January 2025
Most policy on isolation in older adults rests on cross-sectional surveys. A brief look at what that design cannot answer, and what the one randomised trial in the field suggests instead.
18 January 2025
The dominant tool for measuring loneliness was validated on college students in the 1970s. Tracing how it spread into national policy explains why so many loneliness statistics don't agree with each other.
16 January 2025
Health systems are being told to screen routinely for social isolation and loneliness, often through digital intake tools. The evidence for the screening instrument is solid. The evidence that screening improves outcomes is not.
10 January 2025
A single composite measure of social relationships and mortality became three distinct risk factors after 2015. The effect sizes shrank, and the constructs stopped being interchangeable.
31 December 2024
The AHA's 2022 scientific statement on social isolation and cardiovascular health is unusually explicit about the limits of its own evidence base. That candor is worth examining on its own terms.
21 December 2024
National loneliness estimates range from roughly one-fifth to over half of adults. Much of that spread reflects differing instruments and reference periods, not differing populations.
19 December 2024
Nearly every widely cited loneliness figure rests on self-report. A review of the instruments used, and the few cases where researchers have checked self-report against something structural, shows why the numbers do not agree with each other.
18 December 2024
The literature on social connection has produced a long run of positive findings. A look at what a genuine null result would look like, and how rarely the published record contains one.
16 December 2024
A December 2024 study on isolation, age, and loneliness during the pandemic offers a case study in how a negative finding gets reported, and why the loneliness literature rarely produces one.
15 December 2024
Harvard's Making Caring Common found 61% of young adults seriously lonely; Gallup's global survey put the figure for the same age group at 27%. The gap is mostly instrument, not reality.
5 December 2024
Gallup has published loneliness figures four times in fourteen months, each headline number derived from a different survey question. The apparent trend is largely an artifact of instrument, not change over time.
29 November 2024
National loneliness measurement rests on instruments that were designed to ignore how contact happens. That design choice is defensible for validity and disabling for technology policy.
28 November 2024
Three consensus reviews since 2020 have named the same gap in the loneliness literature: an evidence base built on uncontrolled programme evaluations, with almost no randomised trials of what actually reduces loneliness.
14 November 2024
A look past statistical significance at the actual magnitude of the loneliness-mortality association, and what gets lost when odds ratios are translated into headline comparisons with smoking.
11 November 2024
Global survey data consistently show older adults reporting the least loneliness of any age group, even as they remain the most structurally isolated. The two findings are not a contradiction -- they describe different things.