Loneliness Drives Declines in Mental, Cognitive and Functional Health in Older Europeans

Loneliness may be both a cause and a consequence of poor health in later life, according to a longitudinal study published in the European Journal of Ageing. Sabela Siaba, Bruno Casal and Óscar Lourenço analysed data from the Survey on Health, Ageing and Retirement in Europe (SHARE), following adults aged 50 and over across European countries. Using structural equation modelling with a cross-lagged panel strategy, the researchers examined whether loneliness predicts deteriorating health over time, whether declining health fosters loneliness, or both.

The study focused on four health domains: chronic conditions, cognitive function, functional limitations and depressive symptoms. For three of these, the results pointed to dynamic, bidirectional effects. Loneliness was identified as a relevant longitudinal driver of worsening mental, cognitive and functional health, contributing more directly to deterioration in these domains than the reverse. In other words, among older adults, feeling lonely preceded declines in mood, thinking ability and everyday functioning to a greater degree than those health problems preceded loneliness.

Chronic physical illness showed a strikingly different, asymmetrical pattern. Rather than loneliness predicting the accumulation of chronic conditions, the analysis suggested a unidirectional effect running from chronic disease to loneliness: long-standing illness increased the likelihood that participants felt lonely, without a reciprocal effect back onto disease. This contrast suggests that the health consequences of loneliness are not uniform across the body and mind, and that physical and psychological pathways may operate on different timetables.

The authors argue that previous research has tended to examine loneliness and health separately, focusing on one-way associations rather than their reciprocal dynamics. By modelling both directions simultaneously, the study offers population-based evidence that loneliness is a modifiable risk factor in ageing societies, one that sits within a self-reinforcing cycle in which loneliness worsens health and ill health can, in turn, deepen isolation.

The findings carry implications for public health planning. The researchers highlight multidimensional interventions and resource allocation strategies aimed at mitigating loneliness, naming social prescribing, community-based engagement programmes and psychosocial support as approaches that may help break the negative cycle and promote healthy ageing. Because the analysis is observational, drawing on survey data and cross-lagged modelling rather than randomised experimentation, the results indicate longitudinal patterns of influence rather than effects proven through controlled intervention; the authors also note that the article is being shared early as a peer-reviewed, accepted version subject to further edits before the final Version of Record.

Subject of Research: Bidirectional longitudinal relationships between loneliness and health outcomes among adults aged 50 and over in Europe

Article Title: Does loneliness cause poor health or vice versa? A longitudinal analysis across European countries

Article References: Siaba, S., Casal, B., & Lourenço, Ó. (2026). Does loneliness cause poor health or vice versa? A longitudinal analysis across European countries. European Journal of Ageing. https://doi.org/10.1007/s10433-026-00946-5

Image Credits: AI Generated

DOI: 10.1007/s10433-026-00946-5

Keywords: loneliness, ageing, SHARE, chronic conditions, cognitive function, depressive symptoms, functional limitations, cross-lagged panel, Europe, public health, longitudinal study, Does