If You Believe in Science, Don't go Paleo
Eating plenty of fresh produce and lean meats and eliminating processed foods from your diet makes perfect senseâno wonder Paleos lose unwanted
I turned to Professor Marlene Zuk, an actual evolutionary biologist who teaches at the University of Minnesota and is the author of the forthcoming Paleofantasy: What Evolution Really Tells Us About Sex, Diet, and How We Live. Her answer was a resounding no. âMy research has led me into exploring the rates of evolution,â Zuk said in a phone interview. âAnd although I applaud people who are trying to be more thoughtful about what they eat, Iâm a scientist and have to look at the data. You cannot assume that itâs impossible for us to change. Sometimes evolution is slow, sometimes itâs fast, sometimes itâs in between.â
âThe poster child for quick evolution in humans is dairy tolerance,â she added helpfully. What she had to say on that matter was absolutely fascinating. Iâm going to save it for another column, so stay tuned.
Now, where were we? We canât assume that the Paleolithic era was a time of perfect dietary adaptation, either, Zuk noted. For starters, how much meat early humans ate and the ratio of meat to wild plants varied widely, depending on when those small, migratory bands occupied a 55,000-year-long timeline and where they roamed. Those in Ice Age Europe would have had different choices than their counterparts in a neotropical forest or on the African savanna. Whatâs for dinner tonight, honâwoolly mammoth, tapir, or gazelle? Oh.
The diverse array of seasonal foods familiar to early humans would have included fibrous fruits, roots, bulbs, and tubersâone example being the cattail, a multi-use plant that Backwoods Home Magazine recognizes as the âsuper Wal-Mart of the swamp.â
As far as Iâm concerned, the idea that there is essentially one Paleo Diet is up there with the equally ill-founded notion that there is one cuisine that defines India, say, or China. Proponents may put forth clear and logicalâthus easy to understandâarguments, but that doesnât necessarily make them correct.
Recently I spoke with Daphne Derven, an archaeologist and educator who enriches the food world on many different levels. âAmong the Paleos, there seems to be a lack of appreciation of how intelligent and knowledgeable early humans were,â she said. âThey were omnivores, which allowed them to adapt and thrive in ever-changing environments. They were bad-ass, taking down huge creatures. But they also knew that the seeds from a plant turned into the plant. They knew that tubers are more nutrient-dense than the plant itself. Other hominids [primates in the family Hominidae, which includes humans and their fossil ancestors] that had more specific niches in the ecology had less flexibility. They didnât make it. The omnivores did. We are the âready-for-anythingâ species
Derven stressed that there is not a whole lot of evidence from the Paleolithic era, in large part because hunter-gatherers move around so much. But the archaeological record that exists has been studied very, very closely and with increasingly sophisticated methods. âNow we can look at teeth, bones, even seeds in the same context as tools,â she explained. âFor instance, it turns out that the East African hominid species nicknamed âNutcracker Manâ developed a powerful jaw and enormous molars not for cracking nuts, as was previously thought, but for chewing grasses, like a grazing animal. That was the main part of his diet.â Maybe the gazelle was just for special occasions.
One last thing: Letâs not forget to look at the big picture. If you view the Paleo Diet in a certain light, it can be construed as uncomfortably elitist. All that expensive meatâespecially if you hew to the âonly certified-organic and grass-fedâ caveatâmeans that all of Godâs children canât come to the table. And, obviously, there are serious environmental consequences; in a recent Carnegie Mellon study, researchers found the start-to-finish process of raising and distributing red meat causes more greenhouse gas emission than any other food group. Termites, on the other hand...