Es el nervio craneal más largo, actuando como un puente de comunicación entre el cerebro y los órganos vitales (corazón, pulmones, intestino).

Furthermore, the book highlights a crucial, often overlooked connection: the gut-brain axis. By focusing on vagal stimulation, Valenzuela connects mental health directly to physical vitality. He moves the conversation away from the Cartesian dualism that separates the mind from the body, illustrating that mental clarity is often a physiological issue rooted in the gut and the nervous system. In doing so, the book offers a holistic alternative to the often fragmented approach of modern pharmacology, suggesting that the body holds its own innate pharmacy, accessible through vagal toning.