Praised as a modern-day classic by celebrities and readers all over the world, the first edition of Special Diets for Special Kids has been helping children and adults with autism, ADHD, celiac disease, and other disorders since 1998. Special Diets for Special Kids Two followed up in 2001 by providing more recipes and updated research. Now, this revised and expanded edition offers both books in one, complete with the latest research, revised recipes, and color photos throughout The first part of the book describes dietary intervention in detail, from both a scientific and a personal approach (the author's son has autism and has been on a GFCF diet for many years). In a nutshell, certain enzymes are required to break down gluten and casein. If those enzymes don't function well, or are not present at sufficient levels, serious neurological problems can result. Studies have shown that children with autism have a marked deficiency of these enzymes, which may explain why GFCF diets have yielded positive results for many children. Among many other helpful topics, Dr. Lewis explains: