The health benefits of pistachio include a healthy heart, weight management, protection against diabetes and hypertension, and improved digestion. They are one of the few nuts that contain most of the nutrients that are required by humans for complete health. Pistachios are one of the oldest nuts that were commonly used in the world. They are native to Iran and Iraq. Archaeological evidence dates the association of pistachios and man as early as 6,000 BC. Pistachios were cultivated in Iran, Iraq, and Syria and were introduced to the Romans only in 100 AD. A pistachio tree takes about 10 to 12 years to produce the first crop. Pistachios are a drupe, where the fruit has a large seed in the center. This seed is edible. The nuts of pistachio are not seasonal and are available all year long.