This book investigates the relationship between specific nutritional intake and peak athletic performance. Robert Haas, a nutritionist who has worked with professional athletes, presents a framework centered on the concept of metabolic efficiency. He argues that by manipulating the ratios of carbohydrates, proteins, and fats, individuals can optimize their energy levels, recovery times, and overall physical output. The text relies on the author's clinical experience and observations of high-performance athletes to support his dietary recommendations.

Readers frequently note the practical focus of the book on sports-specific nutrition. Experts often categorize this as a foundational text for understanding the intersection of diet and athletic performance in the late 20th century.