Silent brain infarcts are small lesions in the brain that, while they have no effect in themselves, can cause cognitive decline, strokes and dementia. A Finnish study of 2,313 people aged 65 or over gave them brain scans at five-year intervals and asked them about their fish consumption in the intervening time. Those people who ate broiled or baked tuna and other fish high in omega-3 fatty acids three or more times per week had a nearly 26% lower risk of having silent brain infarcts, while even eating one portion of this type of fish a week led to a 13% lower risk.
You can find out more about this research at
http://psychcentral.com/news/2008/08/06/fish-aids-memory-of-older-adults/2700.html
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