Blueberry Why it's so healthy: with one of the highest antioxidant contents of any food, it is definitety good for the nervous system and brain. But the better news is it also helps improve our memory. So pop this jewel just before an exam and you will have no problems remembering all those complex equations. How to eat it: though blueberry is delicious as it is, mixing it with cereal, yogurt or in a shake will bring some variety.