Careful about the conclusions, these are not interventions studies they are observational studies only. Causality therefore is not proved - but the information is consistent with a large amount of theory. I take fish oil every day, and given the prediliction for polyunsaturated (vegetable oils) to oxidize, eat them only when I have to.
http://www.fitnessspotlight.com/2007/11/13/diet-takes-on-dementia/
"A diet rich in fish, omega-3 oils, fruits and vegetables may lower your risk of dementia and Alzheimer’s disease, whereas consuming omega-6 rich oils could increase chances of developing memory problems, according to a new study.
Isn’t it ironic that the very oils we’re told to consume, omega-6 rich polyunsaturated vegetable oils (peanut, corn, soy, etc), are contributors to mental decline? It’s not incredibly surprising if you put the consumption of such oils into the context of evolution. Polyunsaturated vegetable oils have only been possible in the last century or so when we could press huge quantities of grains like corn to get the extremely small amount of oil. Our ancestors never ate corn oil. They weren’t eating olive oil either, but an olive is a naturally oily, fatty fruit. As Ray Peat discusses here, polyunsaturated fats are immunosuppressive."
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