Scientists in Japan studied more than 2,000 people who were 64 years old or older. They wanted to see if the amount of vitamin C in the blood is linked to how the brain looks.
The team measured two parts of the brain with MRI scans: gray matter, which helps us think, and white matter, which connects different brain areas. They also looked at how well a brain network called the default mode network (DMN) was connected. The DMN is important for memory and paying attention.
After taking into account age, schooling, exercise and other factors, the researchers found a clear pattern. People with lower vitamin C levels tended to have smaller gray‑matter volume and weaker connections inside the DMN.
These findings do not prove that vitamin C directly protects the brain, but they add to earlier studies that linked higher vitamin C intake with better thinking skills in older adults.
The scientists suggest that keeping vitamin C levels up could help the brain stay healthy as we age. Future research should follow people over time, check more lifestyle factors, and include participants from different backgrounds.
One researcher explained, "Higher blood vitamin C was linked to a stronger DMN, which means better memory and focus. This hints that a diet rich in vitamin C might support brain health and slow age‑related decline."
Another comment highlighted the importance of everyday food choices: "Finding a connection between a single nutrient and large brain networks shows how our daily meals can shape our brain structure."
Funding for this work came from a Japanese food company and the national medical research agency. Their support did not influence the study design, data analysis, or the decision to publish.