Metabolic Syndrome is a condition involving a large waistline, a risk factor for diabetes and heart disease. It seems smoothies made with blueberry powder may improve endothelial function among men and women with Metabolic Syndrome. In a recent study, 44 adults with Metabolic Syndrome were randomly assigned to receive either two blueberry smoothies per day, or a smoothie without blueberry powder (placebo) over a six-week period. Among the subjects consuming the blueberry smoothies, researchers observed a significant improvement in endothelial function.