Grab a bunch of grapes: men with metabolic syndrome (a set of conditions that can lead to heart disease) who ate the powder equivalent of about two cups of grapes daily for a month lowered their systolic blood pressure by six points, according to a study from the University of Connecticut. The polyphenols in grapes may help relax blood vessels and improve their function, the scientists say. Lesser amounts of grapes may produce a similar though diminished effect, they speculate.