In addition, another variable is that older people who eat lots of foods containing those nutrients may have difficulty absorbing them.
Even so, the study suggests it makes good sense to limit trans fats, which are often found in fried foods, doughnuts, pastries, pizza dough, cookies, crackers and stick margarines and shortenings, and to eat lots of fruits, vegetables and fatty fish.
"The question is: Do people need to eat healthier foods, or do they need to stay away from unhealthy foods? It looks like you need to do both. Eat more healthy foods and stay away from unhealthy foods," Bowman said.
The U.S. National Institute on Aging has more on eating a nutritious diet as you age.
SOURCES: Gene Bowman, N.D., M.P.H., assistant professor, department of neurology, Oregon Health & Science University, Portland, Ore.; Marc Gordon, M.D., chief, neurology, Zucker Hillside Hospital, Glen Oaks, N.Y., Alzheimer's researcher, The Feinstein Institute for Medical Research, Manhasset, N.Y.; Dec. 28, 2011, Neurology, online
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