"Gotta have it" is the thought process of an addicted person. A drink, a drag, a hit, a line, a pill, another piece of chocolate. "Gotta have it." What drives this powerful need known as addiction? The problem isn't with the abused substance or activity, contends Dr. Ruden. The problem lies in the brain. As a result of genetic, hormonal and environmental factors, dopamine and serotonin levels in the brain are altered, and this sets the stage for the craving response. "Gotta have it!" The Craving Brain explains why some individuals are susceptible to addiction to alcohol, gambling or food, while others remain unaffected. It also shows why 12-step programs work, and why we need Alcoholics Anonymous, Gamblers Anonymous or Narcotics Anonymous. Describing a new, revolutionary treatment to prevent the craving response, this book will forever alter our thinking and our approach to this devastating -- but treatable -- condition.