For many years, the issues raised in this book were taboo. The topic of digestion has always been beyond the bounds of decency. In this book, famous writer Mary Roach will tell you in an honest, sometimes shocking way about how our stomach and digestive system work. You will learn how chewing food affects our lives, what Elvis Presley actually died from, how long our stomach can stretch, what our saliva is made of, and many other fun and serious scientific facts.