What are hormones, and what significance do they have for the psyche and our behavior? Do hormones influence our psyche and behavior? Can our behavior influence our hormones? Is there a connection between hormones and mental disorders? This book explores the interplay between the neurobiological foundations of psychological experiences and behavior, endocrine processes, and psychosocial environmental influences. It presents the foundational research of both the scientific disciplines of endocrinology and psychoneuroendocrinology in a way that is accessible to readers without medical or neurobiological backgrounds. This book demonstrates for the first time how these interdisciplinary insights can be implemented into a biopsychosocial coaching approach, which serves both to maintain and promote mental health. It is a coaching approach suitable for both psychosocial counseling and psychotherapeutic practice.