This handy reference provides an overview of why it is important to keep the brain physically and mentally healthy. Chapters describe the choices that teens can make to keep the brain functioning well for a lifetime, such as practicing habits that promote general health and learning new skills that challenge the brain. The book also discusses the negative effects of factors such as poor diet and obesity, drugs and alcohol, lack of sleep, stress, traumatic brain injury, and brain diseases. Information drawn from recent brain research is woven throughout the text. Content fulfills National Health Education Standards.