Did the Pandemic Prematurely Age Our Brains?
The COVID-19 pandemic reshaped our lives in countless ways, and we're just beginning to understand its broader neurological effects. Emerging research suggests the pandemic might have accelerated brain aging even in individuals who never contracted the virus.
A study led by Ali-Reza Mohammadi-Nejad at Nottingham University in the UK utilized a machine learning model trained on 15,000 brain scans to identify age-related structural changes. They then analyzed pairs of brain scans from 996 volunteers from the UK Biobank study. This included a control group of 564 volunteers who had both scans taken before March 2020 (when the UK lockdown began) and another 432 volunteers who had one scan before March 2020 and one afterward. Each scan was, on average, three years apart.
After comparing individuals matched for age, sex, and overall health, the researchers found that the pandemic may have accelerated brain aging by 5.5 months, based on changes to white and grey matter. This was observed even in those without a documented COVID-19 infection. The accelerated aging was particularly noticeable among men and individuals from more socioeconomically deprived backgrounds.
It's important to note that participants in the Biobank study are generally healthier, wealthier, and less ethnically diverse than the broader UK population. This means the findings might underestimate the pandemic's impact on more vulnerable groups and may not be fully generalizable to other populations.
Researchers speculate that factors like loneliness, stress from lockdowns, or lifestyle shifts (such as changes in exercise levels or alcohol consumption) could contribute to these brain changes. The authors suggest that these structural changes could be "at least partially reversible."
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