10 Reasons to Celebrate World Pistachio DayHappy World Pistachio Day! From their rich history, uniquely delicious flavor and remarkable health benefits, there are countless reasons to love pistachios. Today we recognize these reasons and show you 10 more to celebrate the glorious, yet humble pistachio. If you’re already a pistachio nut (pun intended?), prepare to love them even more than you already did. If not, get ready to jump on the pistachio wagon.