[lstyls]

Not only is that anecdotal, but even if it's true it is correlative in the weakest sense. There are undoubtedly countless other features for which "cultures" (how does one define this concretely btw) with low Alzheimer's rates also are outliers.

Here is a great demonstration of how correlation does not imply causation: http://www.tylervigen.com/spurious-correlations.

[piracy1]

Sure. But I'm saying that bit of information would become interesting given the original post which supports a similar idea. I'm not making an assertion of fact simply bringing to mind another data point. Also here. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2781139/ It would seem that this is a rather well documented and often researched thing. Not just a one-off p-hack.

I believe the research I was thinking of was specifically this part of the overview above.:

Various studies and research[9,10] results indicate a lower incidence and prevalence of AD in India. The prevalence of AD among adults aged 70-79 years in India is 4.4 times less than that of adults aged 70-79 years in the United States.[9] Researchers investigated the association between the curry consumption and cognitive level in 1010 Asians between 60 and 93 years of age. The study found that those who occasionally ate curry (less than once a month) and often (more than once a month) performed better on a standard test (MMSE) of cognitive function than those who ate curry never or rarely.[10]

Sources:

9. Pandav R, Belle SH, DeKosky ST. Apolipoprotein E polymorphism and Alzheimer's disease: The Indo-US cross-national dementia study. Arch Neurol. 2000;57:824–30. [PubMed]

10. Ng TP, Chiam PC, Lee T, Chua HC, Lim L, Kua EH. Curry consumption and cognitive function in the elderly. Am J Epidemiol. 2006;164:898–906. [PubMed]