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There is a study on Amish gut flora and it's relation to the metabolic syndrome [0]. Old Order Amish are ideal for studies like that due to them having such a genetically homogenous population. From a quick scan it seems like that even among the Old Order Amish there are variations between individuals gut flora, so I'm not sure they all have that "healthy gut flora" like the parent suggested.

[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3419686/

Just going off of an NYT article from last year about how Amish communities, and especially those who live among farm animals (what I, at least, think of as the "most Amish" lifestyle), have really healthy gut microbiomes:

https://www.nytimes.com/2016/08/04/opinion/health-secrets-of...

There's more and more science about gut bacteria and general health - both body and brain.

The gut...it matters ;)