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Just as there is no magic pill to prevent cognitive decline, no single almighty brain food can ensure a sharp brain as you age. Nutritionists emphasize that the most important strategy is to follow a healthy dietary pattern that includes a lot of fruits, vegetables, legumes, and whole grains. Try to get protein from plant sources and fish and choose healthy fats, such as olive oil or canola, rather than saturated fats. Research shows that the best brain foods are the same ones that protect your heart and blood vessels, including the following: Green, leafy vegetables. Leafy greens such as kale, spinach, collards, and broccoli are rich in brain-healthy nutrients like vitamin K, lutein, folate, and beta carotene. Research suggests these plant-based foods may help slow cognitive decline. Fatty fish. Fatty fish are abundant sources of omega-3 fatty acids, healthy unsaturated fats that have been linked to lower blood levels of beta-amyloid—the protein that forms damaging clumps in the brain