-- Leafy green vegetables like kale, spinach, collards, and broccoli are rich in brain-healthy nutrients such as vitamin K, lutein, folate, and beta carotene. Studies indicate that plant-based diets may be beneficial in delaying cognitive decline.

-- Fatty fish, which are high in omega-3 fatty acids, have been linked to lower levels of beta-amyloid in the blood, a protein that can lead to harmful clumps in the brains of Alzheimer's patients. It is recommended to consume fish at least twice a week, choosing species with low mercury levels like pollack, salmon, cod, and canned light tuna. If fish is not preferred, consider talking to a doctor about taking an omega-3 supplement or consuming land-based sources like walnuts, avocados, and flaxseeds.

-- Berries contain flavonoids, which are plant pigments that contribute to their vibrant colors and are believed to support memory enhancement. Research conducted at Harvard's Brigham and Women's Hospital found that women who ate two or more servings of blueberries and strawberries each week were able to delay memory loss by up to 2.5 years.

-- Caffeine found in coffee and tea may offer cognitive benefits beyond just temporary focus improvement. A study published in The Journal of Nutrition in 2014 showed that participants who consumed more caffeine scored higher on mental function tests. Some research also suggests that caffeine may assist in memory consolidation.

-- Walnuts, in addition to being a good source of healthy fats and protein, have been linked to improved cognitive test scores in a UCLA study. Walnuts are high in alpha-linolenic acid (ALA), a type of omega-3 fatty acid that has been associated with lower blood pressure and healthier arteries, benefiting both the brain and heart. Learn More