Years ago I had a friend and they had their 1st kid.
Kid was always sick,couldn’t figure out why.
Did all types of test etc,nothing.
Finally the went to a Dr and he asked Sams wife a bunch of questions and found out she was washing everything,all the time.
Kid dropped a rattle,wash it off,Kid drops a toy on the ground wash it off and so on.
Dr told her to cut that crap out and allow little Sammie to build up immunities to every day dirt.
Guess what?
It worked.
Like you said “eat dirt”
Not surprised at all. Both my girls were taught the 5-second rule. Pick it up, kiss it to Jesus, and go on eating. Neither one had any allergy problems. People are way too freaky about germs these days. I don't roll around in dirt like I used to, but it don't scare me none. :-)