Living like cave men, or at least eating like them, is being hailed by some as an ideal lifestyle. The paleo diet, based on the idea that our bodies have not adapted sufficiently to eat foods that weren't available 10,000 years ago, focuses on eating meat, fruits and vegetables and avoiding grains and dairy.
But evolutionary biologist Marlene Zuk says that idea is flawed.
In this edited interview, Zuk, the author of "Paleofantasy: What Evolution Really Tells Us About Sex, Diet and How We Live," explains why:
Q: Is there any truth to the idea that we haven't evolved fast enough to cope with modern life?
A: To some extent it is true. Our bodies are ill-suited for sitting at computers all day, for example. Because humans evolved in an environment where they were not crouched over computers, sitting that way all day is going to have ill effects. But it's more nuanced than that. Being bipedal has a lot of costs on the human skeleton, too. Should we all long to be quadrupeds? It just doesn't make sense.