Book excerpt: Personalized Epigenetics, Second Edition discusses the core translatability of epigenetics to health management of individuals who have unique variations in their epigenetic signatures that can guide both disorder and disease prevention and therapy. Fully updated and revised, this new edition details inter-individual variability in the major epigenetic process in humans consisting of DNA methylation, histone modifications, noncoding RNA, and the diagnostic, prognostic, and therapeutic potential of the field. It also reviews the impact of the environment on epigenetic variations among individuals and the role of pharmacology and drug development in personalized epigenetics. Most importantly, the text covers personalized epigenetics from a disease-oriented perspective, presenting chapters that provide advances in widespread disorders or diseases, including diabetes, cancer, autoimmune disorders, obesity, cardiovascular diseases, neurological disorders, and pain management.