According to a survey conducted by the American Academy of Nutrition and Dietetics in 2012, pistachios regulate the microbial composition of the digestive tract. This study showed that pistachio keeps the level of beneficial bacteria in the digestive tract at equilibrium and thereby improves the health of the system.

Pistachio is a prebiotic food which helps the digestive system to function properly. The fact is, the useful intestinal bacteria consume pistachio fiber as a food source which in-turn cause a positive impact on body health.