Book excerpt: Dr. Walker lays out his program on how to become younger which he partly defines as having all or most of the attributes of youth, health, energy, vitality and perpetual laughter on the lips and in the eyes. The key to accessing both more energy and more vitality lies in changing our eating, drinking, and living habits. Dr. Walker encourages people to develop a very definite philosophy he calls Right Thinking, which is maintaining a positive outlook and positive thoughts about themselves and others. Together with the other principles outlined in his program, he offers readers knowledge that gives them the courage to make the changes necessary. Readers are given a brief yet concise introduction to different parts of our anatomy and how these systems work for and against us, depending upon the food we consume. Dr. Walker recommends changing old eating habits to include natural, nourishing foods. The use of juicing, fasting, and eating natural, organic foods in their unprocessed forms, including mostly raw fruits and vegetables, play an important role in maintaining good health. Through his personal observations, experience, and knowledge, Dr. Walker provides the information needed to stay younger.