They sometimes can, but most properly gut-adapted microbes only have their relative prevalence reduced by diet changes, by and large people unfortunately tend t

They sometimes can, but most properly gut-adapted microbes only have their relative prevalence reduced by diet changes, by and large people unfortunately tend to snap back once diet is discontinued. Ideally, you'd combine that with doing a stool transplant first, since it's the main thing (other than just antibiotics) that causes permanent compositional changes.