Our guest on ST Medical Monday is Benjamin Lorr, a writer based in New York City. He tells us about his interesting new book, "The Secret Life of Groceries: The Dark Miracle of the American Supermarket." As Lorr writes in the Introduction for this work: "This book is about the grocery store. About the people who work there and the routes of supply that define it. It is the product of five years of research, hundreds of interviews, and thousands of hours tracking down and working alongside the buyers, brokers, marketers, and managers whose lives and choices define our diet.