Eating a certain group of 'superfoods' may help lower the risk of developing high blood pressure, a study found.Roughly 120 million Americans have high blood pressure, also known as hypertension, which causes the blood to push too forcefully against artery walls. To keep up, the heart must pump harder than it is built to, raising the risk of heart attack, stroke and heart failure.Processed foods and those high in saturated fat have long been shown to raise blood pressure, while vegetables and legumes, which include beans, peas, soybeans and lentils, have the opposite effect.In a new study, researchers sought to understand how much of certain legumes and other healthy nutrients it takes to lower blood pressure. The review of 12 prospective cohort studies followed participants' diets over varying periods of time.The evidence was promising - people consuming the most legumes had a 16 percent lower risk of high blood pressure, and those eating the most soy - such as tofu and edamame - had a 19 percent lower risk, when compared with those eating the least.Experts also discovered that eating about 5oz per day of legumes and about 2.8oz per day of soy can slash the risk of hypertension by almost a third.Experts also discovered that eating about 5oz per day of legumes and about 2.8oz per day of soy can slash the risk of hypertension by almost a third