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By country. Does gut bacteria have differentiation by region/country/diet and by extension can some diets be less causative? http://www.worldlifeexpectancy.com/cause-of-death/parkinson-...

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A silbing comment mentions some causes such as over-cleanliness and c-section, but other more detrimental effects may be lack of breast milk in infancy and antibiotics use (particularly as a toddler/infant).

Some other supporting causes may be things like overuse of antibiotics in meat production and lack of fermented food in diet.

I'm not sure if it has differentiation, but lifestyle factors could have an impact. If, for example, in more developed countries there's a great emphasis on (especially) childhood cleanliness, it may be affecting the development of "good" bacteria:

http://www.bbc.com/future/story/20151118-can-you-be-too-clea...

Another lifestyle example could be the prevalence of C-section births in more developed countries:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3110651/

From the map I linked above, developed countries seem to have high rates. Parkinson's doesn't seem to discriminate there, so is there any other thing interesting by country? Spurious and sounds silly, but spicy foods, maybe?

That would be an interesting data point. Highly acidic...

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