Dr. Jess Steier, an epigenetics scientist, teams up with Dr. Sarah Scheinman, a research expert on nature versus nurture, to dive into how our environment shapes gene expression. They unravel the mysteries of DNA methylation and histone modifications, highlighting landmark studies like the Dutch Famine Birth Cohort. The discussion extends to the influence of nutrition and stress on health, and how experiences impact identical twins differently over time. Together, they explore the exciting implications of epigenetics for personalized medicine and mental health.