Why do we still have allergies if humans have lived around plants for a long time?
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The environments that western children grow up in are typically very clean- this cleanliness prevents children from being exposed to pathogens they would otherwise naturally encounter. Encountering pathogens helps build up immunity to them. So, by spending very little time outdoors and having clean/sanitized homes and schools, kids immune systems don’t have a chance to develop defenses for these allergens, and instead become hyper sensitive.
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