PositiveNPRJonathan Kauffman's new book, Hippie Food: How Back-to-the-Landers, Longhairs and Revolutionaries Changed the Way We Eat, follows the people and places throughout the country that brought organic vegetables and whole wheat bread into the counterculture, and then, eventually, mainstream supermarkets ... For the past five years, he's rifled through old alternative newspapers, studied archives — including one dedicated to soy alone — and interviewed hippie organizers and cooks. His research left him with a fascinating picture of what longhairs ate and where they got it ... So next time you see a shopping cart that features gluten-free ingredients or organic vegetables for a Whole30 recipe, consider the hippies that first found their way to those foods.