New research highlights the importance of vitamin C in maintaining brain health as we age. A study involving over 2,000 Japanese adults aged 64 and older found a significant association between higher blood plasma levels of vitamin C and better brain connectivity as well as greater grey matter volume.
The study, published in PLOS One, focused on the default mode network (DMN), a group of brain regions critical for cognitive functions such as attention and memory. Participants with lower vitamin C levels showed reduced connectivity in the DMN and decreased grey matter volume, both indicators of cognitive decline.
Vitamin C, or ascorbic acid, is vital for tissue repair, immune support, and antioxidant protection against cellular damage. Since the body cannot produce or store it, daily intake is essential. Rich dietary sources include citrus fruits, bell peppers, strawberries, broccoli, Brussels sprouts, and tomatoes, or alternatively, affordable supplements.
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While previous studies have linked vitamin C-rich diets to lower risk of cognitive impairment, this research is among the first to directly correlate plasma vitamin C levels with brain structure and network connectivity in an elderly population.
Researchers from Hirosaki University conducted MRI scans and plasma vitamin C tests, controlling for variables like age and education. The findings suggest that adequate vitamin C status could support cognitive function and potentially counteract age-related decline. However, the researchers stress that these results show correlation rather than causation and call for further studies to unravel the underlying biological mechanisms.
Future research aims to include diverse populations, repeated vitamin C measurements over time, and broader lifestyle factors. As co-author Dr. Tomohiro Shintaku explains, the link between one nutritional element and large-scale brain networks underscores the significant impact daily diet may have on brain aging.