31 October 2024
Why Young Adults Report the Most Loneliness, and Why That Is Not Settled
Across national and global surveys, adults under 30 consistently report the highest loneliness rates. The evidence for why is thinner than the finding itself.
Research
Reviews, analysis and briefs
Everything the Center has published, most recent first. 258 items.
2024
26 October 2024
What the Isolation-Mortality Numbers Cannot Tell Policy Makers
Meta-analyses linking social isolation to mortality risk are observational. That does not make them wrong, but it does limit what a health system can conclude about which intervention would lower the risk.
24 October 2024
What '1 in 5 Feel Lonely' Actually Counted
Gallup's October 2024 finding that more than one in five adults worldwide feel lonely 'a lot' measures a narrow slice of experience. Comparing it with other recent surveys shows how much the headline number depends on the question asked.
23 October 2024
The One-in-Four Figure Rests on a Telephone and Mail Survey Frame
The National Academies' widely cited estimate that a quarter of older adults are socially isolated traces back to a sampling frame built for a different purpose, with consequences for who gets counted.
21 October 2024
The Anxious Generation Argument: What Would Actually Test It
Jonathan Haidt's claim that the shift to phone-based childhood caused rising adolescent loneliness is a specific, falsifiable mechanism. The correlational data available so far cannot adjudicate it.
7 October 2024
Social Prescribing: What the Evidence Actually Supports
Social prescribing is now government policy in the UK and a common feature of social-connection strategies elsewhere. The trial evidence behind it is thinner than its adoption suggests.
24 September 2024
Loneliness Has a Cost Estimate. It Does Not Have a Cost Study.
Reviews of loneliness and isolation routinely cite economic costs -- to health systems, employers, national output. The underlying evidence for those figures is thinner than the claims that rest on it.
12 September 2024
What Changed When the Policy Target Became Social Connection
Between 2018 and 2023, national and international policy shifted its operative construct from loneliness to social connection. The evidence base underneath it did not shift with it, and the prevalence figures do not translate.
10 September 2024
What Cross-Sectional Loneliness Surveys Cannot Tell Us About Technology
Most evidence linking technology use to loneliness comes from single-timepoint surveys. That design cannot distinguish cause from effect, and the one Japanese study built to do so shows why that gap matters.
8 September 2024
What Time-Diary Data Adds That Surveys Cannot
National surveys ask people whether they feel lonely. Time-use data record what they actually did the day before. The two measures move differently, and the gap is instructive.
30 August 2024
How the Surgeon General's Advisory Handled the Gaps in Its Own Evidence
A close read of the 2023 U.S. Surgeon General advisory on loneliness, focused on where it names the limits of its evidence base and where it moves past them without comment.
18 August 2024
The 61% That Isn't the Headline: Young Adults in the Surgeon General's Advisory
The U.S. Surgeon General's advisory reports that about half of adults are lonely. Data specific to young adults, workers, and remote employees suggests the averaged figure understates the problem for several subgroups.
6 August 2024
Screening Young Adults for Loneliness: What the Evidence Actually Supports
The clinical case for screening loneliness in health care settings was built largely on older-adult cohorts. Extending that recommendation to young adults rests on thinner and differently shaped evidence.
28 July 2024
Has the 'Isolation Doubles Mortality Risk' Claim Ever Been Replicated?
A close look at how the frequently cited figures on social isolation, loneliness, and mortality risk were derived, and whether independent replication exists at the scale the claim is usually given.
22 July 2024
Why Loneliness Prevalence Figures Cannot Be Compared Across Countries
National loneliness statistics from the US, UK, and Japan differ by a factor of two or more not because loneliness differs that much, but because the surveys ask different questions.
7 July 2024
How '15 Cigarettes a Day' Became the Number Everyone Cites
The comparison between loneliness and smoking traces back to a single meta-analysis's effect-size comparison. Tracking its path through the Surgeon General's advisory and into federal surveillance shows how much nuance the number lost along the way.
2 July 2024
One Questionnaire, Two Different Risks
Many surveys and reviews report a single loneliness or isolation figure without separating the two constructs, even when the underlying instruments distinguish them clearly. The distinction changes what the number can be used for.
30 June 2024
Phone Bans and the Loneliness Argument: What the Evidence Actually Shows
School and legislative proposals to restrict adolescent smartphone use are increasingly justified as remedies for youth loneliness. The intervention evidence for that specific claim does not yet exist.
28 June 2024
The Age Paradox: Why the Most Isolated Group Reports the Least Loneliness
Older adults have the highest rates of objective social isolation and the lowest rates of self-reported loneliness. The gap is a clean illustration of why the two measures cannot substitute for each other.
22 June 2024
Isolated Is Not Lonely: Untangling Two Statistics About Older Adults
The National Academies' one-in-four isolation figure and the AARP Foundation's one-in-three loneliness figure describe different, only partly overlapping groups of older adults, and the literature frequently treats them as interchangeable.
19 June 2024
What Would a Null Result on Loneliness Even Look Like
A KFF survey breaking loneliness down by race and discrimination raises a broader question: in a literature this consistent, what would evidence against the prevailing story actually look like, and would anyone recognize it?
16 June 2024
What 'Half of Americans Are Lonely' Actually Measured
The Surgeon General's 2023 advisory put U.S. loneliness at roughly half of adults, a figure now repeated across policy documents. The underlying surveys measured different things, at different times, with different instruments.
26 May 2024
The Phone-Displacement Hypothesis: What Would Actually Test It
Jonathan Haidt's Anxious Generation argues that phone-based childhood displaced play-based childhood and caused a rise in adolescent loneliness. The claim is a testable mechanism, not yet a tested one.
15 May 2024
Why Two Major Surveys Disagree on How Many People Are Lonely
Gallup puts global loneliness at 24%; the U.S. Surgeon General's advisory cites roughly half of American adults. The gap is a measurement problem, not a contradiction.