When I was a kid in Australia decades ago we'd never heard of peanut allergies and swapping peanut butter sandwiches at school was the norm. No doubt there were allergies back then but what on earth has made them so much more common these days? Same with asthma. Something has gone terribly wrong.
- Nut Allergies in particular seem to be reduced with early exposure [0]. Maybe dietary trends have changed in a way that causes less early exposure? - Child mortality rate used to be much higher. Children with allergies used to be part of this mortality rate. This combined with parents with mild allergies that might have previously not survived to have children cause the incidence to increase. - People today are exposed to many more types of food. Many people who might have a particular allergy may not have ever been exposed to that allergen.
Another one I’d throw out there would be nearsightedness. Of course a lot of people wear contacts, but I’d imagine incidence of glasses is higher than it used to be.
Reported rates of nut allergies rates have definitely increased though. [1]
[0] https://www.nih.gov/news-events/news-releases/introducing-pe... [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8477625/