I haven't read the book, but sounds like some great guidelines.
Years ago I joined the Feingold organization. It's main purpose is to detect additives and dyes in food that effect childrens behavior. They put out newsletters warning parents/people of where the poisons are hidden in everyday grocery store items. Feingold is the REAL answer to ADD/ADHD.
In eliminating Sugar in my life, I eliminated colds and the flu.
Hard to believe a food intolerance seen as as an inconvenience could end up giving me good health in other areas.