People With Diets High in Vitamins B, C, D, E, and Omega-3s Had Less Brain Shrinkage, Higher Scores on Thinking Tests
Although previous studies have suggested that a heart-healthy diet is also good for the brain, the new study took a different approach by using blood tests to determine the participant’s diet and nutrient levels.
"The combination of the B vitamins, the antioxidants C and E, plus vitamin D was the most favorable combination of nutrients in the blood for healthy brain aging in our population," says study author Gene L. Bowman, ND, MPH, assistant professor of neurology at the Layton Aging & Alzheimer's Disease Center, Oregon Health & Science University, Portland.
Diets high in omega-3 fatty acids, found in fish, were also good for brain health.
Most unfavorable, he found, was a diet high in trans fats. Trans fats are more often found in packaged baked goods and fast foods, including cookies, crackers, and potato chips.
B vitamins are found in a variety of foods, such as milk and dairy, whole grain cereals, enriched bread, and peanut butter. Vitamin C is rich in fruits and vegetables, and E is in nuts and oils. Vitamin D is found in the flesh of fatty fish, such as salmon, and in fortified milk.
For the vitamins, omega-3s, and trans fats, Bowman found an association between diet and brain health, not cause and effect.
The study is published online in the journal Neurology.
Diet and Brain Health: Results
Besides the blood tests, the men and women were given memory and thinking skills tests. Forty-two had MRI scans to measure brain volume. Decreased brain volume has been linked with declines in thinking ability associated with Alzheimer's disease. The researchers evaluated how much of the risk of declining mental abilities could be attributed to diet and how much to other factors, such as age or high blood pressure.