Hirosaki Study Links Low Vitamin C to Weaker Brain Networks in 2,044 Older Adults
Updated
Updated · ttownmedia.com · Jun 12
Hirosaki Study Links Low Vitamin C to Weaker Brain Networks in 2,044 Older Adults
3 articles · Updated · ttownmedia.com · Jun 12
Summary
2,044 Japanese adults aged over 64 showed a clear pattern: lower plasma vitamin C was associated with lower gray matter volume and weaker connectivity in the brain’s default mode network.
MRI scans and blood analyses from the Hirosaki University study, published in PLOS One, still showed those links after researchers adjusted for factors including age, education and overall brain size.
The default mode network supports functions such as attention and autobiographical memory, making the finding relevant to how aging brains maintain cognitive performance.
Researchers said the results suggest optimal vitamin C levels could help support brain health, but stressed the study found statistical associations rather than proving cause and effect.
The team said future work should track vitamin C over time and include broader lifestyle, ethnic and socioeconomic differences to test whether diet can help slow cognitive decline.
Could early brain decline be the hidden cause of low vitamin C, not the other way around?
Can vitamin C supplements reverse existing age-related brain shrinkage or only slow its progression?
How does vitamin C specifically protect the brain's 'daydreaming' network, which is crucial for memory?
2026 Study Reveals Association Between Plasma Vitamin C and Brain Structure in Older Japanese Adults
Overview
A major 2026 study by Haruka Nagaya and colleagues at Hirosaki University explored how vitamin C levels in the blood relate to brain health in over 2,000 older Japanese adults. The research found that those with lower vitamin C had less gray matter in their brains and weaker connections in the default mode network, a key brain system for memory and self-reflection. These findings, published in PLOS One and discussed in a June 2026 article, suggest that maintaining healthy vitamin C levels may help preserve brain structure and function as people age.