Flavonoids, a group of compounds found in plants, have been studied extensively for their positive health impacts. In general, plants that are brightly colored have a good supply of helpful flavonoids; some of the best sources include berries, black grapes and citrus. These compounds have been shown to protect brain cells that are grown in laboratory. This article explains a bit more about how flavonoids help protect our brain cells and their effects on memory and cognition. In another study, Concord grape juice supplements improve memory function in older adults with mild cognitive impairment, subjects with mild memory problems -- not diagnosable dementia -- were randomized and given either grape juice or purple sugar water. Neither the subject nor the researchers knew who was drinking real grape juice. After just 12 weeks, significant improvement in memory and verbal recall was observed in those receiving daily grape juice!
Although the precise mechanism of action by which flavonoids protect brain cells is not known, studies have shown diets rich in berries not only protect brain cells but also lower the risk of high blood pressure, heart disease and cancer.
Berries, grapes, and citrus are potent sources of flavonoids. Beets, both the tops and the roots, are also excellent sources of flavonoids and many antioxidant compounds. The greens have a lot of oxalic acid, which should be avoided by those with a history of kidney stones.
I advocate food as our primary defense to keep our brains as healthy and vibrant as possible. As you know, the Wahls Diet ™ is 9 servings of vegetables and fruit: 3 servings of green leaves, 3 servings of sulfur rich and 3 servings of bright colors. People with diabetes should rely on vegetables, but if you are not diabetic, you may enjoy berries as well. They are wonderful in smoothies, as an accent in salads or as the finishing touch to your meal.