Michael Pollan’s new book, In Defense of Food, provides the backdrop for his talk at the Bagdad Theater in Portland, Oregon, and this prior interview with Deborah Kane of the environmental nonprofit organization, Ecotrust. Remarkably, Mr. Pollan is talking about a defense of food in a literal sense: it’s increasingly difficult to escape from eating foods that are food-like substances (processed foods), but are not whole (real) foods.