Given the trend lately to look backwards, historically, in search of the ideal human diet, I found this article by Rob Dunn really interesting. Dunn discusses some new research that gives us a better idea of what our closest relatives—chimpanzees and bonobos—are eating out in the wild.
Some of the takeaways fit neatly into the current human food zeitgeist—chimpanzees eat a diverse and varied diet, only consume small amounts of meat, and (for obvious reasons) focus on what happens to be in season and available. But some of the information is less apparently applicable to us. For instance, chimpanzees fracking love figs. In fact, different species of figs make up nearly half of all the food the chimpanzees in the study were eating. Figs, people. Can't get enough of 'em.
But the larger point, Dunn writes, is that we can't really apply any of the facts about chimpanzee diets directly to ourselves in a "Just So Story" sort of way. Geography, resource availability, and culture don't work like that. Neither does biology.
You are unlikely to eat like a chimpanzee eats. If you are the average American, you eat more meat and more simple sugar. You eat differently because of choices you make and choices our societies have made (e.g., to produce huge quantities of the foods that most simply satisfy our ancient urges). You also eat differently because the species around you are different, unless you happen to own a greenhouse specializing in tropical African trees.
But even if you were to abandon agricultural food and move into a forest in Tanzania you would still not eat exactly like a chimpanzee. By most reports the food chimpanzees eat tastes bad, at least to humans, (though, one hopes, not to chimpanzees). By some accounting the food chimpanzees eat is also insufficient to keep a human alive and fertile.