There is a theory that humans co evolved with gut worms, and only very recently live without them; certain body functions improve when worms are present: https:

There is a theory that humans co evolved with gut worms, and only very recently live without them; certain body functions improve when worms are present: https://en.m.wikipedia.org/wiki/Effects_of_parasitic_worms_on_the_immune_system https://en.m.wikipedia.org/wiki/Effects_of_parasitic_worms_o...