A newly published study led by researchers from Osaka University and featured in JAMA Network Open reveals compelling evidence that upward social mobility correlates with a reduced risk of dementia. Dementia, a group of conditions characterised by memory loss and cognitive decline, poses significant challenges to healthcare systems and profoundly affects the quality of life for patients and their families. Previous research has established links between socioeconomic status (SES) — encompassing factors like parental assets, education level, income, and occupational status — and susceptibility to dementia. However, the impact of SES changes over a person’s lifetime, known as social mobility, on dementia risk has been less clear.
Drawing from a robust dataset from the Japan Gerontological Evaluation Study, which tracked 9,186 participants aged 65 and older from 2010 to 2016, the study employed sophisticated clustering analysis to examine participants’ SES trajectories. Researchers identified six distinct patterns of SES transitions and analysed their association with dementia incidence using national long-term care service registries.
The findings underscore a significant relationship between upward social mobility and a decreased risk of dementia. Specifically, individuals experiencing upward SES transitions throughout their lives were associated with extended periods of dementia-free ageing compared to those with stable high SES since childhood. In contrast, downward transitions in SES were linked with heightened dementia risk, indicating the critical influence of socioeconomic conditions on cognitive health across the lifespan.
Lead author Ryoto Sakaniwa underscores the profound implications of the study’s findings for dementia prevention: “Our findings not only underscore the importance of socioeconomic mobility in promoting healthy longevity by reducing dementia risk, but they also provide a clear path for future research and intervention strategies. Improving socioeconomic conditions could potentially serve as a pivotal strategy in dementia prevention efforts, a fact that should not be overlooked.”
The study also explored potential mediators of this relationship, including lifestyle behaviours, comorbidities, and social factors. It found that lifestyle choices and physical health characteristics significantly mitigate dementia risk among individuals experiencing upward social mobility. Conversely, social factors appeared to exacerbate dementia risk in cases of downward mobility, underscoring the complex interplay between socioeconomic status and cognitive health.
Senior author Hiroyasu Iso highlights the potential for future research to build on the study’s findings, suggesting that targeted interventions addressing socioeconomic disparities could hold promise in mitigating cognitive decline and promoting healthier ageing. This potential for future research should inspire us to continue our efforts in understanding and preventing dementia.
The study’s findings provide compelling evidence that climbing the social ladder may contribute to prolonged cognitive health and reduced dementia risk. These findings not only underscore the importance of socioeconomic factors in shaping health outcomes across the lifespan, but they also highlight the urgency of addressing these issues. This should prompt further investigation into strategies for enhancing socioeconomic conditions as a means of preventing dementia and promoting overall well-being.
More information: Ryoto Sakaniwa et al, Socioeconomic Status Transition Throughout Life and Risk of Dementia, JAMA Network Open. DOI: 10.1001/jamanetworkopen.2024.12303
Journal information: JAMA Network Open Provided by Osaka University
