The education to parents is at everyone's fingertips with a computer/internet connection today.
Chefs like Ramsay, Bourdain, etc... have made dozens if not hundreds of vids/guides/lessons/free online courses and tips to help people cook better - and for cheaper when possible. And we're not talking fancy 3* cooking here, a lot of those are meant to be doable in 15-30 minutes or less of preparation while being nutritious and delicious (I sound like an infomercial now).
People are busy or lazy and that's one of the core factors.
You can now have access to coupons on your cellphone, read the flyers on them too and can even search which grocery store has sales on x or y rapidly now.
Sure, the govt can help a bit because the price of some produce has increased wildly over the years, but it's not the fundamental problem, imo.