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How dangerous is clean room grown food? I believe, though I have no sources, that exposure builds resistance. Keep your kid inside all the time and he/she ends up with ragweed allergies. Always drink pure water and you'll get the runs when visiting Indonesia. Never tramp around the forest and poison oak will make you break out at the slightest exposure.
I think of it as calluses for your immune system. Ever dug post holes without calluses? It sucks the next day.
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