Eating two servings of fish weekly can provide brain health benefits since it is a great source of omega 3 fatty acids -- which are important for brain function. Having a diet rich in omega 3 fatty acids has been linked to lower risks of dementia and stroke, and can help improve memory.
Yes, chocolate is good for you! Dark chocolate has been found to sharpen focus because of the caffeine it contains. An ounce of nuts or seeds per day is a great source of vitamin E, which may slow cognitive decline.