Book excerpt: When it comes to aging, most of us understand how to keep our bodies healthy and fit, but few of us know where to begin when it comes to taking care of our brains. Do you want to improve your memory, sharpen your thinking, increase your attention span, and boost your mental energy? If so, Dr. Richard Carmon provides all the information you need--including healthy living tips, step-by-step exercises, recipes, and a thirty-day program for maximizing your brain function.