I think it's because all the generations that felt good eating a certain way died off and the only ones we know about died at 60-70 from disease or something. I think of my grandparents talking about their grandparents and how they barely knew them before they died. The problem being; they didn't eat well at that point either and people think thats the time we are talking about. So obviously, with modern medicine coming around from SAD 150 years ago to now, yes I would prefer modern medicine if I were forced to eat synthetic/processed food also. However, 4,000 years ago, it's easy to see the diet was way better and even with our "advanced" knowledge of medicine and food, we are more sick than them. Of course we are being lied to and told that we are the healthiest group in the world and people have always died of disease at 40 years old until our wonderful western medicine came along and saved them.
It's the same thing concerning this, "we need more meat to feed people, how about instead of growing more animals and promoting meat raisers, we grow it synthetically and continue to promote 'healthy grains' as the viable alternative and give heaps of money to wheat farmers." It's ludicrous!
