Maybe fewer consequences than you'd think...
https://rachel.fast.ai/posts/2024-08-13-crowds-vs-friends/
"Your Immune System is Not a Muscle"
> Four main categories of pathogens that humans deal with are viruses, bacteria, fungi, and parasites. The evidence for pathogens that may be beneficial to the immune system is almost entirely for parasitic worms and friendly (commensal) bacteria. In contrast, many viruses can even trigger the onset of autoimmune diseases or allergies.
I'm one of those that tries to jokingly correct the proponents of an often touted phrase by retorting "If it doesn't kill you, it makes you stranger".
The air outside is constantly sterilized by UV light.
Absolutely not, most UV is blocked by the ozone layer, this is why we don't all develop skin cancer at 15. Otherwise, what would be the point of the UV-sterilization method?
Care to taste a spoonful of dirt in a sunny day to see how sterile it is?
This is a pretty common thing kids do. They're generally fine.
As a kid that ocassionally ate dirt, you're usually fine after it, if you ignore the worms you'll poop afterwards. My point was that it's not sterile even if it's under the sun all day, as UV rays don't penetrate deep, and dirt is a good thermal insulator. Bacteria and parasites, specially their spores/eggs, can be very hardy. It's amazing what our digestive system is capable of handling.
It certainly isn't sterile but if a spoonfull of dirt makes you sick then you should already be considered immune compromised.
I've done it, and aside from not being able to breathe well for a while while you douse your mouth and throat with a garden hose, nothing bad will come of it.
The anecdotic evidence they present of immune-system-is-not-a-muscle contradicts anecdotal evidence of doctors, nurses, kids who grew up in a dump, etc. never getting sick due to having amazing immune system.
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That's an absolutely textbook https://en.wikipedia.org/wiki/Association_fallacy
Is this a false fallacy? If somethong can learn, it can be trained, and that's the dictionary definition of train: "to teach so as to make fit, qualified, or proficient".
The fallacy is "if it can be trained, it is therefore logically a muscle".
Ask your same dictionary to define muscle, and ask yourself if the immune system is a "band or bundle of fibrous tissue in a human or animal body that has the ability to contract".