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  • Childhood Loneliness...

Childhood Loneliness Raises Dementia Risk in Later Life: Study

Written By : Dr Riya Dave |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2025-10-03T21:00:09+05:30  |  Updated On 3 Oct 2025 9:00 PM IST
Childhood Loneliness Raises Dementia Risk in Later Life: Study
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Researchers have identified in a new study that loneliness during childhood was associated with accelerated cognitive decline and risk of dementia in middle and older ages. The study was published in JAMA Network Open by Jinqi W. and colleagues. This indicates that mitigating loneliness in childhood is a significant strategy to prevent dementia throughout the lifespan.

The study was conducted with data from the nationally representative China Health and Retirement Longitudinal Study cohort, which followed participants from June 2011 to December 2018, with a maximum follow-up of 7 years. 13,592 participants were included in the analysis with a mean age of 58.34 years (SD 9.39), and 52.8% were female (n=7175). Childhood loneliness was operationalized as recurrent loneliness and not having close friends by age 17.

Adult loneliness was measured with a standardized single item from the Centre for Epidemiological Studies Depression Scale. Cognitive endpoints were episodic memory and executive function, with dementia diagnosed clinically or identified through the presence of cognitive and functional deficits. Statistical methods used linear mixed-effects models for cognitive impairment and Cox proportional hazards regression models for risk of dementia.

Results

  • Possible childhood loneliness was reported by 6525 (48.0%) of the total participants, and clear childhood loneliness was reported by 565 (4.2%) participants.

  • Both groups had significant correlations with long-term brain health outcomes.

  • Childhood loneliness correlated with accelerated cognitive decline, with β coefficients of −0.03 (95% CI, −0.05 to −0.02) SD/year for loneliness and −0.02 (95% CI, −0.02 to −0.01) SD/year for potential loneliness.

  • Notably, childhood loneliness also predicted a higher risk of dementia (HR 1.41; 95% CI, 1.03–1.93).

  • These relationships remained after controlling for adult loneliness and even when analysis was limited to participants without adult loneliness. Adult loneliness was a partial mediator but not a modifier.

  • Adult loneliness mediated 8.5% (95% CI, 2.9%–14.1%) of the association between childhood loneliness and cognitive decline, and 17.2% (95% CI, 4.9%–29.5%) of the association between childhood loneliness and risk for dementia.

  • Adult loneliness, however, failed to significantly modify the strength of either association, such that the risk associated with early experiences remained independently significant.

In this cohort study, childhood loneliness was associated with cognitive decline and dementia risk in middle and later adulthood, even in the absence of adult loneliness. Early interventions aimed at reducing childhood loneliness may help promote lifelong cognitive health and reducing dementia risk.

Reference:

Wang J, Jiao D, Zhao X, et al. Childhood Loneliness and Cognitive Decline and Dementia Risk in Middle-Aged and Older Adults. JAMA Netw Open. 2025;8(9):e2531493. doi:10.1001/jamanetworkopen.2025.31493



JAMA Network OpenChildhood lonelinessdementia riskcognitive declineadult lonelinesslongitudinal studyearly intervention
Source : JAMA Network Open
Dr Riya Dave
Dr Riya Dave

    Dr Riya Dave has completed dentistry from Gujarat University in 2022. She is a dentist and accomplished medical and scientific writer known for her commitment to bridging the gap between clinical expertise and accessible healthcare information. She has been actively involved in writing blogs related to health and wellness.

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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