What is it about?
This study examined how often feeling lonely relates to self-reported memory and thinking problems (subjective cognitive decline) among over 86,000 U.S. adults. Using national survey data, we found that the more frequently people felt lonely, the higher their likelihood of experiencing cognitive decline — rising from about 10% among those who never felt lonely to nearly 46% among those who always felt lonely. Women who frequently felt lonely were at particularly higher risk than men. These findings suggest that loneliness is a modifiable social factor that may affect brain health, and that reducing loneliness could help protect cognitive function across the lifespan.
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Why is it important?
Loneliness is increasingly recognized as a public health crisis. This study, using one of the largest nationally representative datasets available, provides strong evidence that chronic loneliness is not just an emotional problem — it may be an early warning sign for cognitive decline and dementia. The findings support integrating loneliness screening into routine healthcare, particularly for women and middle-aged adults.
Perspectives
As a health equity researcher, this work reflects my ongoing interest in how social determinants shape health outcomes across populations. Loneliness disproportionately affects underserved communities, and identifying it as a modifiable risk factor for cognitive decline opens an important policy window — one that aligns well with our center's mission to advance health equity through evidence.
Oluwasegun Akinyemi
Howard University
Read the Original
This page is a summary of: Loneliness and cognitive decline among U.S. adults: A stratified analysis of the BRFSS, PLOS One, May 2026, PLOS,
DOI: 10.1371/journal.pone.0339554.
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