An interesting way to affect gut bacteria is to get a fecal transplant. It doesn't look fun, and I don't know how well it works, but I bet that's the direction

An interesting way to affect gut bacteria is to get a fecal transplant. It doesn't look fun, and I don't know how well it works, but I bet that's the direction to go. https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/fecal-transplant https://www.hopkinsmedicine.org/health/treatment-tests-and-t...