A bit beside the point of TFA, but reading about "rewilding ourselves" reminded me of some research on human parasites [0].
Tldr is that the parasite dampens the immune system, and our bodies have evolved to deal with that dampening, so in places (like the US) where parasitic infection is relatively rare, diseases involving hyperactive immune systems (allergies, T2 diabetes, asthma, etc) are much more common.
So to really rewild, maybe we should all go out and eat some raw snails out of the nearest stagnant body of water. (50% /s?)