It's pretty worrisome when you look at the amount of influence held by the packaged food industry as a whole. And of course chain restaurants are pretty big too. Might be a bit tinfoil hat. But I really think that's the biggest reason why there hasn't been much of a push for people to cook more. Nobody's making bank selling broccoli. They are selling a big mash of cheap filler with the words "healthy!!" all over it and a couple tiny little pieces of broccoli thrown in.  Meanwhile cooking versions of almost anything at home is often simple, tastes better after a little practice, will have a better nutritional profile and usually far less calories.