Pistachio is a small tree originating from Central Asia and the Middle East. In a 100 gram serving, pistachios provide 562 calories and are a rich source of protein, dietary fiber, several dietary minerals and the vitamins. Pistachios are a good source of calcium, vitamin B5 and vitamin E (table).Pliny the Elder writes in his Natural History that pistachio seeds were a common food as early as 6750 BC.