Junk food is irresistible because it's engineered to be irresistible by food chemists, using very cheap basic ingredients modified with artificial flavours and colouring. That's the whole point - publicly-traded food companies are in the business of making a profit for their shareholders, not in keeping customers healthy. Of course, actually killing customers off or making them so sick they could not eat would be bad for profits, too.
The ideal junk food would be something that was mostly air, could be expanded on-site to save on shipping costs, and could be sold at a substantial profit : movie theatre popcorn. We evolved to eat fatty food because it's a good source of energy and we don't have to spend our entire life grazing on low-energy plants like a giraffe. Arctic explorers burn through pounds of butter to get the 7000 calories a day they need to survive, pulling sleds across the ice at 40 below.
Food science, or rather, ideas about what is healthy or unhealthy seem to change every few years - salt is in, then it's out, then it's in again. Me, I figure if I sweat salt I need to replace it. I don't believe any natural foods - including pizza - are really unhealthy, but that eating more food that you need to build an emergency fat reserve must be a bad thing.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.