Book excerpt: A humorous, refreshing treatment of a timeless subject, "The Skinny" is not a book about nutrition or sensible eating -- it's a book about what it really takes to get thin. Starting with the "experts" (doctors, nutritionists, biochemists, and diet gurus), and then moving on to those who truly know something about weight loss, the women who have done it, authors Marx and Sistrom have conducted the necessary research to find what really works. Sorting through the methods and motivations of thin women everywhere, here, for the first time, they share the secrets behind success at losing weight, including the Skinny on: