Lifestyle Psychiatry represents a groundbreaking approach to mental health care, rooted in evidence-based lifestyle interventions and drawing upon the pillars of physical activity, nutrition, stress resilience, substance use cessation, quality sleep, and connectivity. As a vital addition to the Lifestyle Medicine series, this book transcends traditional psychiatric practices by incorporating theories, methods, and empirical findings from health psychology and behavioral medicine. By embracing a comprehensive biopsychosocial framework, Lifestyle Psychiatry aims to prevent and treat psychiatric disorders while promoting overall mental and physical well-being through lifestyle modifications.