Nuance my friend. I am going to guess that Wilderman is referring to modern processed foods that often come in boxes (e.g cookies) or bags (e.g skittles). And I guess it’s his way of making a catchy phrase to get people to limit those overly processed foods.
But in reality, there are lots of foods that come in boxes that aren’t really hyper processed. E.g oats, lentils, beans. Which can be really valuable, especially in situations where non perishable food is needed.
So tldr. He probably is just trying to sum up his dietary beleifs in a sentence, when boxes and bags aren’t really a good rule on what’s healthy or not.
Me and my bag of apples beg to disagree.
Sounds like what he is trying to reference is something about wars being drivers for new technology to preserve food? And that like, canning and dehydration and preservatives make things not food. Honestly no idea why he’d specifically bring the cold war into it, I would say WWII was hugely more influential on bringing highly processed food mainstream