Barley's fiber, potassium, folate, and vitamin B6 content, coupled with its lack of cholesterol, all support a healthy heart. Barley is an excellent source of fiber, which helps lower the total amount of cholesterol in the blood, thereby decreasing the risk of heart disease.
A randomized, double-blind study from 2007 found that barley intake significantly reduced serum cholesterol and visceral fat, both of which are markers of cardiovascular risk.
The beta glucan fiber found in barley lowers LDL ("bad") cholesterol by binding to bile acids and removing them from the body via excretion. An intake of 3 grams of beta-glucans per day can lower blood cholesterol levels by 5 percent.
In one study, those who consumed 4,069 milligrams of potassium per day had a 49 percent lower risk of death from ischemic heart disease compared with those who consumed less potassium (about 1,000 milligrams per day).
Vitamin B6 and folate, both present in barley, prevent the buildup of a compound known as homocysteine. When excessive amounts of homocysteine accumulate in the body, it can damage blood vessels and lead to heart problems.