Paleo, the pace of evolution, and chronic stress
My Jockology column in today’s Globe and Mail takes a look at the paleo diet — or rather, the paleo “lifestyle.” The column is actually in the form of an infographic in the paper, beautifully illustrated as “cave art” by Trish McAlaster. Unfortunately, the online version so far just lifts the text, without any of the data and graphics that accompany it. Nonetheless, it’s hopefully worth a read!
As a teaser, here’s an excerpt from a section on how the pace of evolution has changed over the past few thousand years, and what that means for the quest for the perfect “ancestral” diet:
The paleo diet depends on the assumption that our genes haven’t had time to adapt to the “modern” diet. Since evolution depends on random mutations, larger populations evolve more quickly because there’s a greater chance that a particularly favourable mutation will occur. As a result, our genome is now changing roughly 100 times faster than it was during the Paleolithic era, meaning that we have had time to at least partly adapt to an agricultural diet.
The classic example: the ability to digest milk, which developed only in populations that domesticated dairy animals. More than 90 per cent of Swedes, for example, carry this mutation. Finnish reindeer herders, in contrast, acquired genes that allow them to digest meat more efficiently, while other populations can better digest alcohol or grains. The “ideal” ancestral diet is most likely different for everyone. [READ THE WHOLE ARTICLE]
And, as another teaser, here’s a section of Trish’s infographic illustrating the difference between the acute stress of the paleo lifestyle compared to the chronic stress of modern life: