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this post was submitted on 18 May 2026
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The most likely explanation is that kaolinite clay is known to reduce nausea and diarrhea.
https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2022.893831/full
I compost and a common practice is to throw a handful of your native soil into your pile when you start it, to inoculate it with local soil bacteria. Bacteria do most of the work in an active compost pile.
I wonder if people were getting some kind of gut flora benefit from this.
I wonder this exact thing, given that soil is a living organism full of beneficial bacteria and other organic materials. The food we eat consumes it, takes what it needs, and then we do the same.
I find it also interesting that while the article claims this is a cultural thing vs. being done for heath benefits, I’d argue it became cultural because of a universal understanding of health benefits.
Now I’m not saying this is some long lost concept that is the missing key to fix all our ills, however I can see how consuming soil was an integral part of maintaining gut health and boosting immunity way before we understood how those systems work.
Yeah I don’t see an answer, but it is possible that it is chemical and not about flora, because I keep seeing “clay” mentioned specifically, instead of “soil.”
I agree that just saying “it’s cultural” is not an explanation. Cultures are not entirely arbitrary.
Depending on the composition of the soil it might also have antiparasitic properties.
Or they could be beneficial parasites, like that episode of the space show.