Looking to improve your memory and stay mentally alert? Eat brain-boosting foods like sage, beets, sardines, oats, and cage-free eggs. If you drink tea, try a cup of yerba mate. Researchers have found that this tea can help improve short-term mental power. Lentils are another great food for boosting your brain power as they are high in folate. Walnuts are high in omega-3 fatty acids and antioxidants which has been linked to helping mental performance. Boost your brain power today!