For a growing number of people, the good old days go back — way back — to the Paleolithic era.
When people lived a life of hunting and gathering.
There are websites, blogs and dozens of new books (including the “Paleo Diet,” “Paleo Solution” and, yes, even “Living Paleo for Dummies”) that cater to Paleo-enthusiasts. These folks, who believe that humans reached their peak more than 10,000 years ago, often adopt some vestiges of Stone Age lifestyle by going barefoot or adopting the Cave Man Diet, which forbids such foods as grain and dairy.
The movement has found a foe in University of Minnesota biologist Marlene Zuk, author of a new book, “Paleofantasy: What Evolution Really Tells Us About Sex, Diet and How We Live.” Zuk argues that Paleo-philes are making some unscientific assumptions, especially on how rapidly evolutionary changes can happen. We talked with Zuk at her office on the St. Paul campus about eating meat, exercise and the limits of instinct.
Q: Do you agree with the Paleo-enthusiasts that there’s something unhealthy about our civilization?
A: Absolutely. There is something about modern life that is at odds with the way our bodies work. All you have to do is look around at the skyrocketing rates of diabetes. What I question is this assumption that we could turn back time and go back to some particular era and be better off.
Q: But what could be simpler than a life of hunting and gathering?
A: There is no more reason to believe that one point of evolution is better or worse than any other. For example, eating meat is thought to have occurred originally through scavenging from animals already killed by lions or other predators, rather than through hunting.
So, when human beings moved away from scavenging and started hunting, should they have had this big angst of, “Oh, no! We evolved to be scavengers! Hunting is bad!”?
There is no end goal to evolution, so the idea that we had evolved to perfection and are now falling from grace is a misreading of how evolution really works.
Q: You seem to be questioning what is natural.
A: Yes. Some people say it’s natural to eat a certain way or live a certain way. Does that mean that other forms that came before were not natural?
Is it natural for us to be bipedal? We evolved to walk on two legs, but you could argue that it’s really bad for us because it is not very beneficial for childbirth. It creates a lot of problems because the pelvic girdle cannot accommodate the large human skull size. Plus, we get a lot of back problems that quadrupeds do not have. Being bipedal is a drag.
And of course, since all life arose in the sea, we could even argue that being aquatic is more natural than this newfangled thing of living on land and evolving lungs. Gills have worked very well for millions of years.