Caffeine can make you more alert ( coffee, tea, dark chocolate)
Glucose (not table sugar) found in complex carbohydrates can offer short term memory boost and help thinking process.
Breakfast-such as high fiber whole grains, dairy and fruit help you concentrate
Fish containing omega three fatty acids enhance memory- especially as you get older
Blueberries-prevent age related conditions such as Alzheimer’s and improved learning and muscle function with aging.