I’ve heard there have been studies that indicate that in some part modern allergies are our bodies directing an evolved immune response that we once needed for all the parasites we constantly carried. They gave parasites to people that had certain food allergies and suddenly their food allergies were just straight up gone.
https://www.science.org/content/article/got-allergies-blame-parasites
https://healthland.time.com/2012/04/18/doctor-infects-himself-with-parasites-for-health-experiment/
Ok, just in case anyone else had the same thought, this is not the podcaster and oldest brother of Travis and Griffin McElroy. This is just a dude that does sick commissioned art.