Want to supercharge your neurons? Or at least have a better shot at remembering where you put your car keys? Drink some grape juice. In one study conducted at the University of Leeds, “highly stressed” subjects (working women between forty and fifty years old with preteen children) who drank about 12 ounces of grape juice showed immediate improvement in brain performance. Some of the gains continued even after the subjects stopped drinking the juice. An earlier study showed that a group of older adults with mild cognitive decline had improvements in memory after drinking somewhat more grape juice. There is also some evidence that drinking grape juice can lower blood sugar levels, helping protect against diabetes, which is associated with dementia (although the diabetes-dementia connection is not entirely clear to researchers). The polyphenols in grape juice are antioxidants and help rid your brain of pesky free radicals.