A University of Alabama at Birmingham (UAB) study suggests that the Mediterranean diet, which emphasizes consuming foods that contain omega-3 fatty acids found in fish, chicken and salad dressing, and avoiding saturated fats, meat and dairy foods, may be linked to preserving memory and thinking abilities. However, the same association was not found in people with diabetes. The research is published in the April 30, 2013, print issue of Neurologyฎ, the medical journal of the American Academy of Neurology.
"Since there are no definitive treatments for most dementing illnesses, modifiable activities, such as diet, that may delay the onset of symptoms of dementia, are very important," said Georgios Tsivgoulis, M.D., a neurologist with UAB and the University of Athens, Greece.
Data came from the Reasons for Geographic and Racial Differences in Stroke (REGARDS) study, housed at UAB. REGARDS enrolled 30,239 people ages 45 and older between January 2003 and October 2007, and it continues to follow them for health changes.
In this study, the largest yet done on the Mediterranean diet, dietary information from 17,478 African-Americans and Caucasians, average age of 64, was reviewed to see how closely they adhered to a Mediterranean diet. Study subjects also underwent tests that measured memory and thinking abilities over an average of four years. A total of 17 percent of the participants had diabetes.
The study found that in healthy people, those who more closely followed the Mediterranean diet were 19 percent less likely to develop problems with their thinking and memory skills. There was not a significant difference in declines between African-Americans and Caucasians. However, the Mediterranean diet was not associated with a lower risk of thinking and memory problems in people with diabetes.
"Diet is an important modifiable activity that could help in preserving cognitive functioning in late life," said Tsivgoulis. "However, it is only one of several important lifestyle activities that might play a role in late-life mental functioning. Exercise, avoiding obesity, not smoking cigarettes and taking medications for conditions like diabetes and hypertension are also important."
The study was supported by the National Institute of Neurological Disorders and Stroke, one of the National Institutes of Health, and the Department of Health and Human Services.
- G. Tsivgoulis, S. Judd, A. J. Letter, A. V. Alexandrov, G. Howard, F. Nahab, F. W. Unverzagt, C. Moy, V. J. Howard, B. Kissela, V. G. Wadley. Adherence to a Mediterranean diet and risk of incident cognitive impairment. Neurology, 2013; 80 (18): 1684 DOI: 10.1212/WNL.0b013e3182904f69
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