Here are five foods that help to keep your brain healthy and reduce your risk of developing neurodegenerative conditions. Leafy greens are a good source of vitamin A, which supports cognitive functions such as learning and memory. Berries are full of flavonoids, a type of antioxidant that helps protect against neurodegenerative disorders. Nuts contain omega-3 fatty acids that help to maintain proper blood flow. This ensures that your brain gets all the oxygen it needs to function properly. Fatty fish is also a great source of omega-3 fatty acids. Experts say that eating one square of dark chocolate with at least 70% cocoa a day can improve your brain health. This is because dark chocolate is rich in antioxidant flavonoids.