What do you think of the hygiene hypothesis?
http://en.wikipedia.org/wiki/Hygiene_hypothesis
The Hygiene hypothesis states that a lack of early childhood exposure to infectious agents, symbiotic microorganisms, and parasites increases susceptibility to allergic diseases by modulating immune system development.
This could explain why there has been a rise in peanut allergies in recent decades, a thing that didn’t really exist in older times.
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