Encountered my first chip snob the other night: a friend who refused to go near the Tostitos I had grabbed in my rush to get all guacamole ingredients at one corner store when I was late to the Pinetum party. But she’s right. It’s no coincidence that the bag is increasingly cluttered with “whole grains” boasts to distract us from what we’re really eating, starting with genetically modified corn. When your only consolation on the label is “no preservatives,” you know something might not be fit to eat.