Poor blood circulation is a common problem for those suffering from diabetes. But improving circulation can be as easy as eating pistachios shows a new study published in the Journal of the American Heart Association. According to the study having pistachios may reduce vascular response to stress in type 2 diabetes patients. For the study researchers randomized patients with type 2 diabetes with one of the two test diet designed for the study. One of them included a standard heart-healthy diet with 27 percent fat and seven percent saturated fat and another diet had two servings per day of pistachios