Ah, is this satire?
Okay, if this is satire, is brilliant. Total hat tip, I've never written anything this good.
If it's not satire, it sounds like you know the answers already.
The world was different when we were kids. Nut allergies barely existed because pollution and processed food was far less prevalent. You have to ban nuts in schools, kids throats literally close up and they can die within minutes. It's not a matter of education, nuts are literally more dangerous than they used to be.
I would argue that parents are taking way better care of their kids than our parents did, we were left alone a lot. I had to make mine and my sisters lunches and our diets were terrible.... but again the difference is the processed foods. I don't think kids or parents are lazier these days at all, I think the odds are stacked against them way more than 40 years ago.
Education for kids and parents isn't the only solution... the proper solution is to regulate industries correctly so that corporations can't pollute our environments and have to stop poisoning us. We could put huge amounts of effort into making incredibly healthy meals and chances are there would still be more trace chemicals and pesticides and carcinogens than the food your grandparents made... even though my grandparents burnt their toast every single morning.
Still again, if this is satire, bloody brilliant mate and feel free to tease me with a big ol whoooosh.