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Although it sounds like a bit of a stretch, eating certain foods can have a positive effect on your memory retention ability. From improving blood flow to the brain to helping form structural components of brain cells, eating these foods certainly won’t hurt you: Avocados, berries (any kind), coconut oil, eggs, cold water fish, dark chocolate, olive oil, walnuts, leafy green vegetables, and turmeric. Throwing these foods into your diet gives you all kinds of good fats and vitamins that can help strengthen your brain.