Although more study is needed, researchers believe the improved effect has something to do with the amount of lutein that kiwis contain. Lutein has antioxidant properties.
For the study, participants ate three kiwis daily for eight weeks. At the end of the eight weeks, their 24-hour systolic blood pressure was an average of 3.6 mm of mercury lower compared to people who ate apples instead.
The American Heart Association recommends eating 4.5 cups of vegetables and fruits in a variety of colors every day.