Emerging research suggests that the COVID-19 pandemic may have aged our brains, even in those who never contracted the virus. A recent study found that stressors such as social isolation, health fears, and general uncertainty during the pandemic period were enough to accelerate brain aging—especially among older adults, men, and individuals from socioeconomically disadvantaged backgrounds.
Beyond the Virus: The Broader Psychological Toll
While past studies have focused primarily on the effects of the virus itself, this investigation—led by the University of Nottingham—points to the broader psychological and social toll of the pandemic as a key contributor to neurological aging.
“What caught me off guard the most was seeing a clear increase in brain aging in individuals who had never tested positive for COVID,” said lead author Dr. Ali-Reza Mohammadi-Nejad, a research fellow at the university’s Sir Peter Mansfield Imaging Center. “It highlights just how impactful the overall experience of the pandemic was on brain health.”
The team analyzed brain MRI scans from nearly 1,000 healthy individuals aged 47 to 80, using data from the UK Biobank. They split participants into two main groups: one that had undergone scans before and after the onset of the pandemic (including subgroups with and without COVID-19 infection), and a control group scanned twice prior to the pandemic.
Gray Matter, White Matter, and Predictive Models
To assess brain aging, researchers built predictive models based on imaging data from over 15,000 healthy individuals. Separate models accounted for differences in gray and white matter as well as sex-based variations. Gray matter is involved in processing information and synaptic connections, while white matter enables communication between brain regions.
The primary measure was the rate of change in the brain age gap (RBAG)—the difference between predicted brain age and actual age—adjusted for the time elapsed between scans. The results showed that the pandemic-exposed group exhibited significantly faster brain aging compared to the control group, regardless of infection status. However, only those infected with the virus showed noticeable declines in cognitive performance, particularly on the Trail Making Test, which evaluates executive function and processing speed.
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Older participants, especially those who had COVID-19, showed greater increases in brain age. The effect was more pronounced in men than in women, particularly in gray matter regions. Socioeconomic disadvantage also played a role—participants with lower scores in areas such as income, education, and employment experienced greater brain aging, underscoring the impact of social inequality during health crises.
Although the study reveals a strong association between pandemic exposure and accelerated brain aging, it does not prove direct causation. It also has several limitations: only two scan points were analyzed, making it unclear whether the brain changes are permanent. Additionally, the sample included only healthy adults aged 45 and older, limiting generalization to younger populations or those with existing health conditions.
Broader Lessons for Public Health and Equity
Despite these limitations, the study offers valuable insights. It emphasizes that prolonged psychological stress—even without illness—can have measurable effects on brain structure and aging. It also highlights the importance of addressing social and economic disparities to reduce health vulnerability in future crises.
Our findings show that brain health is influenced by more than just physical illness—it’s shaped by the environment we live in,” said Professor Dorothee Auer, the study’s senior author. “While we don’t yet know if these changes are reversible, the possibility remains, and that’s something we should hold onto.
Read the original article on: New Atlas
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