A new study published in the journal PLOS One suggests that higher vitamin C levels in the blood are associated with healthier brain structure and stronger brain network connectivity in older adults. The research provides another reminder of the potential value of vitamin C-rich foods, including citrus fruits and juices.
The study — “Plasma Vitamin C Levels Are Associated With Brain Structural Networks on MRI: A Large Cohort Study” — was led by Haruka Nagaya and colleagues in Japan. Researchers analyzed data from 2,044 adults with a median age of 69 who participated in the Hirosaki University Iki-Iki Health Promotion Project. Participants underwent brain MRI scans and blood testing to measure vitamin C levels.
The researchers focused on two important indicators of brain health. The first was gray matter volume, which contains many of the brain’s nerve cell bodies and is critical for memory, learning and decision-making. The second was connectivity within the brain’s default mode network (DMN), a system of interconnected brain regions involved in memory, self-reflection and cognitive function.
After accounting for factors such as age, sex, education, physical activity, smoking, alcohol consumption and common health conditions, the researchers found that people with lower vitamin C levels tended to have lower gray matter volume and weaker DMN connectivity. In other words, higher vitamin C levels were linked with markers of better brain structure and network integrity.
The study does not prove that vitamin C directly prevents brain aging or cognitive decline. Because it was observational, researchers could only identify associations rather than cause-and-effect relationships. However, the findings support previous research suggesting that vitamin C may help protect the brain because of its antioxidant properties and its role in reducing oxidative stress, which has been linked to neurodegenerative diseases.
For the citrus industry, the findings are noteworthy because citrus fruits are among the richest dietary sources of vitamin C. Regular consumption of oranges, grapefruit, mandarins and other citrus products can help people maintain healthy vitamin C levels.
While more research is needed to determine whether increasing vitamin C intake can directly improve brain health, this study adds to the growing body of evidence connecting citrus-derived nutrients with healthy aging.
The authors concluded that vitamin C may play an important role in maintaining the structural integrity of the brain and preserving key neural networks as people age. Future studies will be needed to determine whether boosting vitamin C intake through diet, including citrus consumption, can help support long-term cognitive health.
See the full study here.
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