Pistachios

Pistachios contain lutein and zeaxanthin, two carotenoids that help protect against age-related macular degeneration, the leading cause of blindness in the elderly. They may also help improve cholesterol levels. 

Did you know?: In December 2008, Dr. James Painter, a behavioral eating expert professor and chair of School of Family and Consumer Sciences at Eastern Illinois University, described the Pistachio Principle. The Pistachio Principle describes methods of "fooling" one's body into eating less. One example used is that the act of deshelling and eating pistachios one by one slows one's consumption allowing one to feel full faster after having eaten less.