Book excerpt: The media has called attention to new ?epidemics? of chronic illness in children, including ADHD, autism, food allergies, asthma, and obesity. Are they real, and if so, why are so many children getting sick? This book, rooted in scientific literature, answers these questions for parents. Many children considered healthy by their pediatricians show subtle signs of ill health. The author explains how to prevent these illnesses, and how to help those who are already ill.