As ZuchinniFlower points out, walnuts are high in antioxidants. There was a study a couple of years ago that found that the top three foods tested for such activity were in ascending order: walnuts, pomegranate, and rose hips. Coffee is also high and is, in fact, the leading source in many of our diets - which may explain why coffee is linked to lower PD rates.

Perhaps even more important, walnuts are an excellent source of fatty acids that are far more important to the nervous system than once thought. If they are out of balance, dopamine levels drop across the board for starters.

And pomegranates are a phytochemical treasure trove. That deep color is the giveaway. The pigments, like those in berries, are multifunctional magic.