Black Beans

Black Beans
All beans are good for your heart, but none can boost your brain power like black beans. That's because they're full of anthocyanins, antioxidant compounds that have been shown to improve brain function. A daily 1/2-cup serving provides 8 grams of protein and 7.5 grams of fiber. It's also low in calories and free of saturated fat.
(from 8 Food to Eat Everyday)