News Release

University of Kentucky study: Healthy dietary intake associated with lower brain iron, better cognition in older adults

Peer-Reviewed Publication

University of Kentucky

University of Kentucky Study Finds Healthy Dietary Intake Associated With Lower Brain Iron, Better Cognition in Older Adults

image: University of Kentucky researchers conduct an MRI scan as part of the study, which suggests that a healthy diet is linked to lower brain iron and better cognition in older adults. view more 

Credit: University of Kentucky

LEXINGTON, Ky. (Aug. 26, 2021)  Research conducted at the University of Kentucky College of Medicine suggests that higher intake of specific nutrients is associated with lower brain iron concentration and better cognitive performance in older adults.

The study was recently published in the Neurobiology of Aging and highlights the important balance of non-heme iron for optimal neuronal function. Excess non-heme brain iron has been associated with neurological diseases such as multiple sclerosis and Alzheimer’s disease. High levels of brain iron can also be seen in normal aging, where they have been correlated with poor cognitive performance.

A key question is whether age-related increases in brain iron and related cognitive declines can be slowed by environmental factors, such as healthy dietary intake. To explore this question, the research team evaluated the relationship between nutritional intake, brain iron and cognitive performance in a group of healthy, older adults between 61 and 86 years old.

The team was able to address the question using a variety of methods including computer assessments to quantify working memory performance, questionnaires to obtain nutrition information and an in vivo MRI technique called quantitative susceptibility mapping to measure iron concentration in brain tissue.

Consistent with previously published work, the results indicated that increasing age was associated with higher levels of brain iron concentration and poorer working memory performance. However, those older adults with high dietary intake of nutrients commonly found in nuts, soybeans, olive oils, and fish (such as vitamin E, lysine, DHA omega-3 and LA omega-6 PUFA) tended to have lower brain iron and better working memory performance than expected for their age.

“Our results suggest that these nutrients may offer protection against brain iron accumulation and cognitive decline in older adults,” said Valentinos Zachariou, Ph.D., a researcher in the UK Department of Neuroscience and first author of the publication.

“Our promising correlational findings provide motivation for follow-up clinical trials to assess whether specific nutrition can slow brain iron accumulation in older adults,” said Brian Gold, Ph.D., professor of neuroscience and principal investigator of the study.

In addition to Zachariou and Gold, several other key researchers from UK and other institutions contributed to the research, including Edward Hall, Ph.D., Christopher Bauer, Ph.D., and Elayna Seago in the UK Department of Neuroscience, D. Allan Butterfield, Ph.D., in the UK College of Arts and Sciences’ Department of Chemistry, and Georgia Panayiotou, Ph.D., with the Department of Psychology at the University of Cyprus.

This work was funded by the National Institute on Aging and the National Institute of General Medical Sciences.

Research reported in this publication was supported by the National Institute on Aging of the National Institutes of Health under Award Numbers R01AG055449, R01AG068055 and P30 AG028383; National Institute of General Medical Sciences of the National Institutes of Health under Award Number S10OD023573. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

The University of Kentucky is increasingly the first choice for students, faculty and staff to pursue their passions and their professional goals. In the last two years, Forbes has named UK among the best employers for diversity, and INSIGHT into Diversity recognized us as a Diversity Champion four years running. UK is ranked among the top 30 campuses in the nation for LGBTQ* inclusion and safety. UK has been judged a “Great College to Work for" three years in a row, and UK is among only 22 universities in the country on Forbes' list of "America's Best Employers."  We are ranked among the top 10 percent of public institutions for research expenditures — a tangible symbol of our breadth and depth as a university focused on discovery that changes lives and communities. And our patients know and appreciate the fact that UK HealthCare has been named the state’s top hospital for five straight years. Accolades and honors are great. But they are more important for what they represent: the idea that creating a community of belonging and commitment to excellence is how we honor our mission to be not simply the University of Kentucky, but the University for Kentucky.

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