The study, conducted by Jeremiah Stamler, M.D., lead author of the study, and colleagues, showed that a 4.72 percent higher dietary intake of the amino acid glutamic acid as a percent of total dietary protein correlated with lower group average systolic blood pressure, lower by 1.5 to 3.0 millimeters of mercury (mm Hg). Group average diastolic blood pressure was lower by 1.0 to 1.6 mm Hg.
In the study, researchers examined dietary amino acids, the building blocks of protein.
In the study, researchers analyzed data from 4,680 middle-age people participating in an international population study on the effects of dietary nutrients on high blood pressure. Participants were from the U.S., U.K., China, and Japan.
The results showed that a nearly 5 percent higher intake of glutamic acid as a percent of total protein in the diet was linked to lower average blood pressure. Systolic blood pressure was lower by an average of 1.5 to 3.0 points and diastolic blood pressure was lower by 1.0 to 1.6 points.
Stamler said that the study might help explain on a molecular level why the Dieatary Approaches to Stop Hypertension (DASH) diet lowers blood pressure.
The DASH eating pattern, developed by the U.S. National Institutes of Health, is rich in fruits, vegetables and low-fat and nonfat dairy products as well as whole grains, lean poultry, nuts and beans.
The study has been published in Circulation: Journal of the American Heart Association.
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