An interesting thought path.
As omnivores, humans (it would follow) are highly adaptable and can survive in a number of different environments in which they may find themselves: tropical, arctic, desert, forest, grassland, etc.
That's why Inuit have done quite well on a diet of blubber. Amazon tribes (I'm just guessing here) know which plants and fruits are good to eat, and perhaps animals and insects, too. Desert dwellers? Camel anyone? Diets around the world are unique to the place, right?
So why do we (Americans) keep bashing each other over which diet is best? I'm no libertarian, but I think "government guidelines" applicable to publicly-funded institutions have a significant downside: school lunches, food subsidies, and medical advisories to name a few.
As an individual, I get to choose, more or less. But if government guidelines make a public enemy of fat, salt, or (I wish) sugar, then the food supply shifts accordingly for everyone.
Obviously, I have too much time on my hands right now. Mainly I'm tired of everything being adversarial rather than collegial. A little mutual respect for opinions, not to mention research, would be helpful. People should be able to tell the difference between propaganda and information--but of course, we can't, or don't.
I have liked this forum for many years. It's roomy. It's cordial. It's loaded with information. I get to choose which stories seem relevant to me, and follow up on the facts.
It's great to know that as an omnivore, I have all the choices in the world!