ELI5 Gluten - why have folks suddenly become allergic to gluten this past decade?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Humanity has lived off bread for thousands of years, so why has the past decade seen such a rise in people 'allergic' to gluten? What is gluten intolerance? What is Celiac’s disease? Why did doctors once think that a banana diet was its cure? Finally, are there any negative effects from a gluten-free diet?

... We explain like i'm five!

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Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: addacus117, p3tunia, the1ine, police-ical, pupperpowell, pantstoespantstoes & nohissyfits

NPR article referenced

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