Ketogenic is a term for a low-carb diet (like the Atkins diet). The idea is for you to get more calories from protein and fat and less from carbohydrates. You cut back most on the carbs that are easy to digest like sugar soda pastries and white bread. Early in the development of Alzheimer's disease the brain becomes over excited potentially through the loss of inhibitory or GABAergic interneurons that keep other neurons from signalling too much. Because interneurons require more energy compared to other neurons they may be more susceptible to dying when they encounter the Alzheimer's disease protein