Our average life expectancy is increasing. However, a long life only has a high quality if we are not only physically fit but also if our brain is healthy and capable. How can we remain mentally clear and active into old age? Preston Estep introduces a new dietary approach that helps prevent Alzheimer's, dementia, and other neurodegenerative diseases, thereby significantly extending the actual "lifespan" of our brain—he calls it "Mindspan" in analogy to "Lifespan." Estep draws on the dietary habits of populations and cultural communities with the longest periods of mental fitness. He explains the changing nutritional needs of the body as we age and discusses which potentially harmful factors are present in our daily food.