Why our allergies are getting worse - and what to do about it

If it seems like your seasonal allergies are getting worse over time, you're probably not wrong. Estimates are that 30 to 40% of the world's population now have some form of allergy, and medical anthropologist Theresa MacPhail says allergic reactions — including everything from hay fever to eczema and asthma — are growing in the U.S. and around the world.

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