Eli5: Why are nut allergies and gluten intolerance so prevalent and serious in certain populations (like in much of the US), and negligible to the point of being even considered a myth in other parts of the world?

Question

Eli5: Why are nut allergies and gluten intolerance so prevalent and serious in certain populations (like in much of the US), and negligible to the point of being even considered a myth in other parts of the world?

In: Biology

Answer 1

Genetically modified crops, pesticides, and other things are usually the fist suspect, but companies and individuals representing those companies generally lash out saying there is no evidence of this. Studies paid for by these same agencies say there is no correlation.