eli5: why do humans have allergies (hay fever, pollen, etc)
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One issue specifically with hay fever is that we’ve establishes a policy in cities of planting males trees (dioecious male) that don’t bear fruit that would need to be cleaned up very often. Instead we’ve surrounded ourselves with many, many, many very lonely pollen producers.
Another issue is with our increased use of anti-inflammatories. Most Over The Counter anti-inflammatories are COX / COX-2 inhibitors. A side effect of these inhibitors is that they halt the production of mucus for the protection and proper functioning of your stomach and intestines. Overuse leads to Leaky Gut Syndrome where food particles that aren’t normally absorbed can now enter the blood stream directly which can then cause an immune response and long term oversensitivity.
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