Common vitamin may influence brain aging in ways scientists didn't expect

Key Points:

• A Japanese study involving 2,044 older adults found that higher blood levels of vitamin C are associated with healthier brain structure, including greater gray matter volume and stronger connectivity within the default mode network (DMN), which is important for memory and cognition.
• The research, published in PLOS ONE, used MRI scans and controlled for factors like age, smoking, and diabetes, highlighting a direct link between plasma vitamin C levels and brain structural connectivity rather than relying on dietary estimates.
• The study suggests that consuming vitamin C-rich foods such as citrus fruits, berries, tomatoes, and leafy greens may support brain health during aging, though it emphasizes that vitamin C is only one factor among many influencing cognitive function.
• Limitations include the observational, cross-sectional design, reliance on a single blood measurement, and a participant pool primarily consisting of older Japanese adults, which may limit generalizability and prevent establishing causality.
• Researchers caution that while the association is notable, vitamin C’s impact on brain health is modest compared to established risk factors like high blood pressure and blood sugar, and should be considered part of a broader approach to brain aging.