What’s going on with these strange allergic reactions? Peanut allergy has become epidemic.
Immune systems take time to build. Yes, some allergies clearly are familial / genetic. But there are switches that turn them on and off. In the past, kids got vaccinated less and later. The last few decades has seem the pediatric schedule start at TWO months old, with a heavy bunch of the every two months into newborns, whose immune systems are not built yet. Vaccines and antibiotics early do quite a number on the immune systems.
Interestingly, a life change to improve your own immune system can help outgrow allergies too.
I remember watching an episode of "Married with Children" where the hungry kids would fight over crumbs that had previously fallen under the stove, yuck. The father explained to others that they could survive anything because they ate crap, and had a lot of immunity.
My oldest daughter lets her kids do what they want, when it comes to playing around unsanitary places. Running around barefoot, eating things that dropped on the ground, playing with others' toys, etc. She says how else can they build their immunity. She seems to have a point, as my grandkids never get sick and have no allergies. If you overprotect kids, you may be increasing their risk by not having built up immunities to allergens and toxins.