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Of course one diet is not beneficial for everyone, but I'll leave this here for everyone to think about. It is directly from the literature as I was researching GI bacteria.
A diet high in fat derived from milk increases Firmicutes like Bilophila wadsworthia and they have a disruptive effect on our immune system through Th1.
A diet high in fat or high in beef increases Firmicutes like Erysiperlotrichaceae and Bacteroides fragilis. Erysiperlotrichaceae are tied to IgA reactions, TNF alpha, and are immunogenic. They are also enriched in colorectal cancer, IBD, and Crohn's Disease.
A high fat diet with low fiber decreases butyrate producing bacteria and increases hydrogen sulfide producing bacteria. This decreases short chain fatty acids and increases secondary bile acids like LCA and DCA. A LCA/DCA ratio over 1 is associated with increased risk of gallstones, breast cancer, and colorectal cancer.
No one diet is for everyone, but knowing how our food causes bacterial changes to our microbiome is important for long term health.
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