A simple nutrient found in everyday foods may play an important role in protecting brain health as people grow older. A new study from Japan suggests that maintaining adequate levels of vitamin C in the body could be linked to better brain structure and stronger brain connectivity among elderly adults.

Researchers studied more than 2,000 adults aged above 64 years and examined the relationship between vitamin C levels in their blood plasma and brain health using MRI scans.

The study found that people with lower vitamin C levels were more likely to have reduced gray matter volume, which is an important indicator of healthy brain function. They also showed weaker connectivity within the brain’s default mode network, a system associated with attention, memory, and personal experiences.

The researchers observed that these associations remained even after considering other factors that can influence brain health, including age, physical activity, and educational background.

“This finding generates the exciting hypothesis that a diet rich in vitamin C might play a supportive role in maintaining brain health and mitigating age-related cognitive decline in older adults,” said study co-author Tomohiro Shintaku from the Graduate School of Medicine at Hirosaki University.

Vitamin C, a powerful antioxidant, is known for its role in supporting immunity and protecting cells from oxidative stress. Scientists believe its protective effects may also extend to the brain by helping maintain healthy brain tissues and communication networks.

However, researchers cautioned that the findings show an association and do not prove that vitamin C directly prevents cognitive decline. More extensive studies involving diverse populations are needed to confirm whether increasing vitamin C intake can slow age-related changes in the brain.

Shintaku said the most significant aspect of the research was identifying subtle links between a single nutritional factor and large-scale brain networks in a community-based group of more than 2,000 older adults.

The findings highlight the growing importance of diet and lifestyle choices in supporting healthy ageing. While no single nutrient can guarantee protection against brain decline, maintaining a balanced diet rich in essential vitamins and minerals may contribute to better overall brain health in later years.