Researchers have found another clue that diet may influence how the brain ages. In a study of more than 2,000 older adults in Japan, people with lower levels of vitamin C in their blood tended to have less gray matter and weaker connections within an important brain network involved in memory and attention. While the findings do not prove that vitamin C protects the brain, they strengthen evidence that good nutrition could play a role in maintaining cognitive health later in life.
The research, led by Haruka Nagaya of Hirosaki University in Japan, was published on June 10, 2026, in the open access journal PLOS One.
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