This week, we’re talking about allergies. Everything from hay-fever to serious nut allergies plague our daily life, but why do we get them?

I’m joined by Theresa Macphail, to discuss this topic. She’s the author of the new book Allergic: How our immune system reacts to a changing world.

She explains what allergies are, why some are more dangerous than others, and whether there is a possible future where we no longer have to worry about allergies.

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