The best diet for overall health, and specifically for heart, brain, and cancer risk reduction, is a diet that's aggressively low in carbohydrates with an abundance of healthful fat, and this is the central theme of 'Grain Brain.'
Increase your consumption of healthful fats like extra virgin olive oil, avocado, grass-fed beef, wild fish, coconut oil, nuts and seeds. At the same time, keep in mind that modified fats like hydrogenated or trans fats are the worst choices for brain health.