Food allergies have skyrocketed in the last 30-40 years and there is a direct connection with intestinal flora: https://www.sciencedaily.com/releases/2019/06/1

Food allergies have skyrocketed in the last 30-40 years and there is a direct connection with intestinal flora: https://www.sciencedaily.com/releases/2019/06/190624111545.htm https://www.sciencedaily.com/releases/2019/06/190624111545.h... There is evidence that soil influences a person's microbiome: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780873/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780873/ Both of these studies are less than a year old, intestinal flora is something that's only recently started to get attention.