Yes, pistachio nuts are beneficial for pregnant women. According to a study published in the Western Farm Express, pistachios can help control gestational diabetes in pregnant women. They are also rich in vitamins and minerals. Pistachio nuts are a good source of Vitamin B6, a nutrient that helps in the neurological development of your unborn baby. However, it is recommended that you consult with your doctor before including pistachios in your pregnancy diet, mainly to check for allergies.