Beets

Beets and beet products are high in nitrates, which your body converts into a molecule called nitric oxide. Your body relies on nitric oxide for a variety of reasons, including proper blood flow, brain function, and nerve cell communication.

Some studies have shown an improvement in brain function after consuming nitrate-rich beets and beet products. Taking 15 ounces (450 mL) of beet juice increased blood flow to the brain and enhanced performance on a subtraction test, according to one research involving 40 adults. By eating roasted beets with a meal before an exam or drinking fresh beet juice while you study, you can enhance the number of nitrates in your diet.