Psychiatrist Anna Lembke, medical director of Stanford's addiction medicine program, examines how modern life overwhelms our brains' pleasure circuits, leading to compulsive behaviors and dissatisfaction even without substance addiction. Drawing on neuroscience research and clinical experience treating patients addicted to everything from heroin to social media, she explains how the brain's dopamine system evolved for a world of scarcity and how constant access to high-reward stimuli dysregulates this system. Lembke uses patient stories to illustrate principles - a patient whose pornography use escalated until it destroyed his marriage, another who found peace through deliberate exposure to cold water. Her central insight is that pleasure and pain are processed by the same neural mechanisms, which seek balance: intense pleasure is followed by a compensatory pain state that drives continued seeking. This framework explains why more stimulation leads to less satisfaction and why ascetic practices can paradoxically increase well-being. Lembke offers practical strategies for resetting overwhelmed reward circuits, including 'dopamine fasting' and the deliberate introduction of challenges. The book speaks to anyone struggling with compulsive use of phones, food, or other modern pleasures, offering scientific understanding and practical guidance. Lembke writes accessibly without oversimplifying, helping readers understand their own experiences through a clinical lens.