Over a period of about 6 months I worked to much and became very wore out. My body became intolerant to almost everything I ate causing me to become weaker and weaker losing weight I can't afford to loose. I am very thin to start with. The information in this book helped me to rule out a lot of food my body is intolerant to and helped me get to a base diet that gives me energy when I stay on it. I basically am on stage 4. I am starting to get my strength back. I believe that what you put in your body affects everything. It is the starting point. When I eat the wrong foods I know it because it affects my thinking and energy. The information in this book has made a great impact on my life.