This book investigates the fundamental question of how external stimuli—ranging from physical substances to environmental factors—consistently influence an individual's internal Life Energy. Dr. John Diamond, a medical doctor and pioneer in the field of behavioral kinesiology, presents a framework for understanding the body's unconscious responses to its surroundings. By utilizing the kinesiological muscle test as a diagnostic tool, the author argues that the body possesses an innate, objective wisdom that bypasses conscious thought to reveal the true impact of various stimuli on overall health.

The text is regarded as a seminal work in the field of behavioral kinesiology, offering a foundational look at the intersection of physical stimuli and human energy. The framing suggests an accessible entry point for readers interested in alternative health practices and the mechanics of the muscle test.