Dr. Day sounds like a quack to me. Anyone who says that all illnesses are caused by this or that is practicing medicine with blinders on. It makes sense to me that many diseases may be initiated by viruses or bacteria and the body's autoimmune response to them also factors heavily into the equation. I think that there will be a substantial increase in the number of diseases found to have been caused or initiated in this manner in the near future. Life also has to be enjoyable and to cut out everything and never eat anything that you enjoy because it may not be good for you makes as little sense as overdoing eating anything you want. Fad diets come and go, it seems like moderation is the key to sucess as in so many areas of our life.