An article reported in The Times stated that "Eating lots of nuts, fish and poultry, whilst cutting down on red meat and butter could reduce the risk of Alzheimer's"
The study followed the dietary patterns of 2,000 elderly people (aged 65+) in the New York for an average of 4 years. However there are causality issues; we cannot be certain that the reduced risk of AD is due to diet, there are other extraneous variables which haven't been controlled such as whether the participants exercise regularly, smoke or have a history of Alzheimer's in the family.
The study was a cohort study so none of the participants had Alzheimer's disease at the start, researchers could then over the duration of the study see who developed the disease. The researchers have concluded that a dietary pattern is strongly protective against the development of AD; however further research is required.
I found this article of interest as I have recently completed a paper on the disease and it's current treatments available. I am also focusing my biology coursework on Alzheimers.
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