Book – This book’s popularity is likely due to Dr. Perlmutter’s assertion that one’s genetic predisposition to mental aging is not set in stone, and that by altering our diets we can reduce the neurological degeneration that our parents and grandparents may have exhibited. Gluten free, low-sugar diets have become increasingly prevalent for a variety of reasons. In Grain Brain, Dr. Perlmutter shares compelling research linking gluten and sugar consumption to neurological degeneration such as that which occurs within dementia and Alzheimer’s patients. Dr. Perlmutter has the distinction of being both a neurologist and a nutritionist, and this book recounts incidences where a change in his patients’ diets alleviated symptoms from various neurological disorders. Grain Brain is also filled with references to other researchers’ studies on the impacts of elements such as “good fats” on the brain. His main premise is that all gluten sources are damaging to the brain, including whole grain sources. More easily digested is his confidence that the consumption of “healthy” fats found in fish, nuts, and eggs, will prolong the health of our brains. Grain Brain includes a 4-week plan of healthy eating and exercise. This book will obviously appeal to anyone who is already inclined to try a low-carb, or “Paleolithic” diet. However, proponents of a diet relying heavily on whole grains, as symbolized by the USDA Food Pyramid, have been less pleased with Dr. Perlmutter’s recommendations.