I found the book to be very helpfull in eliminating foods that caused alot of mucus. I have found that many of the foods that they list do/don't work, however if you boil it down it almost gets back to just eating healthy. Stay away from dairy, high fructose corn syrup...refined foods. It helped me find alot of alternatives that were a better choice. Doc says sugar is a drug and stay away. Hard to do in this day and age. After a while one has to find what works best for them, but I found the book to be helpfull in listing those foods that didn't do well with me.