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Original Article
Volume 336:1117-1124 April 17, 1997 Number 16
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A Clinical Trial of the Effects of Dietary Patterns on Blood Pressure
Lawrence J. Appel, M.D., M.P.H., Thomas J. Moore, M.D., Eva Obarzanek, Ph.D., William M. Vollmer, Ph.D., Laura P. Svetkey, M.D., M.H.S., Frank M. Sacks, M.D., George A. Bray, M.D., Thomas M. Vogt, M.D., M.P.H., Jeffrey A. Cutler, M.D., Marlene M. Windhauser, Ph.D., R.D., Pao-Hwa Lin, Ph.D., Njeri Karanja, Ph.D., Denise Simons-Morton, M.D., Ph.D., Marjorie McCullough, M.S., R.D., Janis Swain, M.S., R.D., Priscilla Steele, M.S., R.D., Marguerite A. Evans, M.S., R.D., Edgar R. Miller, M.D., Ph.D., David W. Harsha, Ph.D., for The DASH Collaborative Research Group

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ABSTRACT

Background It is known that obesity, sodium intake, and alcohol consumption influence blood pressure. In this clinical trial, Dietary Approaches to Stop Hypertension, we assessed the effects of dietary patterns on blood pressure.

Methods We enrolled 459 adults with systolic blood pressures of less than 160 mm Hg and diastolic blood pressures of 80 to 95 mm Hg. For three weeks, the subjects were fed a control diet that was low in fruits, vegetables, and dairy products, with a fat content typical of the average diet in the United States. They were then randomly assigned to receive for eight weeks the control diet, a diet rich in fruits and vegetables, or a "combination" diet rich in fruits, vegetables, and low-fat dairy products and with reduced saturated and total fat. Sodium intake and body weight were maintained at constant levels.

Results At base line, the mean (±SD) systolic and diastolic blood pressures were 131.3±10.8 mm Hg and 84.7±4.7 mm Hg, respectively. The combination diet reduced systolic and diastolic blood pressure by 5.5 and 3.0 mm Hg more, respectively, than the control diet (P<0.001 for each); the fruits-and-vegetables diet reduced systolic blood pressure by 2.8 mm Hg more (P<0.001) and diastolic blood pressure by 1.1 mm Hg more (P = 0.07) than the control diet. Among the 133 subjects with hypertension (systolic pressure, >140 mm Hg; diastolic pressure, >90 mm Hg; or both), the combination diet reduced systolic and diastolic blood pressure by 11.4 and 5.5 mm Hg more, respectively, than the control diet (P<0.001 for each); among the 326 subjects without hypertension, the corresponding reductions were 3.5 mm Hg (P<0.001) and 2.1 mm Hg (P = 0.003).

Conclusions A diet rich in fruits, vegetables, and low-fat dairy foods and with reduced saturated and total fat can substantially lower blood pressure. This diet offers an additional nutritional approach to preventing and treating hypertension.


Source Information

From the Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins University, Baltimore (L.J.A.); the Department of Medicine, Brigham and Women's Hospital, Boston (T.J.M., F.M.S.); Merck and Company, Westwood, Mass. (T.J.M.); the Division of Epidemiology and Clinical Applications, National Heart, Lung, and Blood Institute, Bethesda, Md. (E.O., J.A.C.); Kaiser Permanente Center for Health Research, Portland, Oreg. (W.M.V., T.M.V., N.K.); Duke Hypertension Center (L.P.S.) and the Sarah W. Stedman Center for Nutritional Studies (P.-H.L.), Duke University Medical Center, Durham, N.C.; the Department of Nutrition, Harvard School of Public Health, Boston (F.M.S.); and the Pennington Biomedical Research Center, Baton Rouge, La. (G.A.B., M.M.W.). Other authors were Denise Simons-Morton, M.D., Ph.D. (National Heart, Lung, and Blood Institute, Bethesda, Md.); Marjorie McCullough, M.S., R.D., and Janis Swain, M.S., R.D. (Brigham and Women's Hospital, Boston); Priscilla Steele, M.S., R.D. (Beltsville Human Nutrition Research Center, U.S. Department of Agriculture, Beltsville, Md.); Marguerite A. Evans, M.S., R.D. (National Heart, Lung, and Blood Institute, Bethesda, Md.); Edgar R. Miller III, M.D., Ph.D. (Johns Hopkins University, Baltimore); and David W. Harsha, Ph.D. (Pennington Biomedical Research Center, Baton Rouge, La.).

Address reprint requests to Dr. Vollmer at the Kaiser Permanente Center for Health Research, 3800 N. Kaiser Center Dr., Portland, OR 97227-1098.

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