This book investigates the hypothesis that an individual's genetic makeup dictates their optimal nutritional requirements and susceptibility to specific health conditions. Dr. Peter J. D'Adamo, a naturopathic physician, and co-author Catherine Whitney present a framework that categorizes individuals into six distinct 'Genotypes' based on physical traits and ancestral markers. The authors argue that by aligning dietary intake and lifestyle choices with one's specific genetic profile, readers can mitigate health risks and optimize metabolic function.

The subject matter points to a specialized approach to personalized nutrition that requires readers to engage in self-assessment and data tracking. The framing suggests a comprehensive, albeit unconventional, alternative health guide intended for those seeking to tailor their dietary habits to their perceived biological markers.