Several studies have confirmed that antioxidative omega-3 fatty acids help slow cognitive decline associated with the aging process. One study in older adults found that fish oil supplementation was associated with a significantly lower mean cognitive subscale score on the Alzheimer's Disease Assessment Scale and higher Mini-Mental State Examination scores. A separate study found that consumption of omega-3 fatty acid was associated with improved working memory performance.
For more information on fish oil supplements, read here.
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Cite this: Fast Five Quiz: How Much Do You Know About Medical Factors That Help and Hinder Memory? - Medscape - Feb 18, 2015.