So, in case you aren't being facetious, 1. different species foster different microbiomes, you're better off looking at studies of actual human dietary impact

So, in case you aren't being facetious, 1. different species foster different microbiomes, you're better off looking at studies of actual human dietary impact on gut bacteria: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6478664 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6478664 2. gut bacteria isn't necessarily bad (but having no gut bacteria is bad)