The Health Benefits of Pistachios: Why This Tree Nut Should be Your Go-to Snack FoodPistachios are tree nuts that have been around for thousands of years. The first book of the Bible, the book of Genesis, mentions pistachios. One male tree is able to create two dozen female nut-bearing trees from its pollen. It takes five years for those trees to bear fruit. But those nut-bearing trees can continue producing pistachios for almost two centuries. Yet, domestic pistachio orchards came into vogue in America only recently, during the 1970s. Until even more recently, California almonds had center-stage for high nutritional value snacking. But it seems pistachios are gaining in nutritional stature within the tree nut industry, especially as the darker side of the almond industry becomes more well-known. Research studies done on pistachios show they are an excellent pre-biotic food source good at preventing diabetes, and that pistachio consumption in correlated to longer life spans.