" One of the accepted tenets in the battle against Alzheimer’s is that we need to focus on the health of the heart and vascular system to help prevent Alzheimer’s, or at least slow its progression. You’ve probably heard it before, but it’s true: What is good for the heart is good for the brain. This what the MIND diet—a diet high in fruits and vegetables, fish and poultry, and olive oil—is all about. Preliminary studies have shown that adhering to the Mediterranean-based, heart- and brain-healthy diet may lower the risk of Alzheimer’s by as much as 53 percent. If you opt, instead, for a ketogenic diet to provide ketones, you are thwarting the healthful eating element of the equation and missing out on a lot of nutrients. Relying on a ketogenic diet might provide some short-term benefits, but it would likely mess things up in the long run. "