By Heidi Lewis Author Michael Pollan says, “Eat food. Mostly plants. Not too much.” It sounds like a Zen kōan, doesn’t it? By “food,” Mr. Pollan means eating nonprocessed, natural fare. He says, “If your grandmother wouldn’t recognize it, don’t eat it.” That rules out the center aisles of the supermarkets where the snacks are usually found. Instead of chips, [...]