by Wei Perng, PhD

In Michael Pollan’s book, In Defense of Food: An Eater’s Manifesto, he laid out 12 Commandments for Serious Eaters. The first commandment is “Don’t eat anything your grandmother wouldn’t recognize as food.” This makes sense, given evidence that processed, hard-to-digest, chemical-ridden foods are a large contributor to our expanding waistlines and declining health. I’ve always thought that this was a good rule to follow. After all, it’s hard to argue with the fact that my grandmother, who eats lots of steamed veggies, fruits, and wild poultry, would likely not identify Cheetos, Hot Pockets, Power Bars, or Lunchables as food. As it turns out, there is yet another reason why we should eat what our grandparents eat: evolution!