Dietary Patterns, Sodium Intake and Blood Pressure (DASH - Sodium)
NCT ID: NCT00000608
Last Updated: 2016-07-29
Study Results
Results pending
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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Recruitment Status
COMPLETED
Clinical Phase
PHASE2
Study Classification
INTERVENTIONAL
Study Start Date
1997-02-28
Study Completion Date
2002-07-31
Brief Summary
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To compare the effects of three levels of dietary sodium and two patterns of diet (a control diet and an intervention diet high in fruits, vegetables, and low fat dairy products and low in fat) on blood pressure in individuals with higher than optimal blood pressure or with Stage 1 hypertension.. DASH - Sodium built on and extended the results of the NHLBI-initiated Dietary Approaches to Stop Hypertension (DASH) study.
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Detailed Description
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BACKGROUND:
High blood pressure, defined as systolic blood pressure greater than or equal to 140 mm Hg or diastolic blood pressure greater than or equal to 90 mm Hg, or taking antihypertensive medication, affects 24 percent of the United States adult population or about 50 million people. Because the risk of cardiovascular disease and stroke increases with increasing blood pressure throughout the entire range of blood pressure levels, people with blood pressure above the optimal level of 120/80 are at increased risk of disease. Approximately 48 percent of the adult population have blood pressure either normal but above optimal levels or have Stage 1 hypertension, a prevalence which increases with age. To combat this highly prevalent condition, primary prevention through lifestyle modification represents a highly promising strategy for public health.
DASH - Sodium extended research from DASH trial to address several issues of relevance to clinical practice and public health and capitalized on the success of DASH by following the multicenter outpatient feeding study model. The model permitted a true test of efficacy because of high adherence and follow-up rates. In addition, the population studied across four geographic areas, encompassing individuals with diastolic blood pressure between 80-95 mm Hg and systolic blood pressure \<160 mm Hg, was broadly representative, thus making the results generalizable to a large portion of the United States population.
DESIGN NARRATIVE:
The effects on blood pressure of three levels of sodium intake and two dietary patterns were compared. The combined impact of sodium reduction with dietary intervention was evaluated as a potential non-pharmacologic treatment alternative to drug therapy for stage one hypertension or for maintaining normal blood pressure levels. The two dietary patterns were a control diet that represented the typical American diet and an intervention diet (DASH diet) that was high in fruits, vegetables, included whole grains, poultry, fish, and nuts, and reduced in fats, red meat, sweets, and sugar-containing beverages and dairy products. The three levels of sodium were higher (current United States intake), intermediate (current recommended levels), and lower (potentially optimal levels). Participants were assigned to one of the two dietary patterns using a parallel group design and were fed at each sodium level using a randomized cross-over design.
Three eligibility pre-screening visits were followed by a two-week run-in feeding period and then a four-week intervention period at each of three sodium levels. During the run-in for the intervention feeding periods, all food was provided to participants. They were required to attend the clinic for at least one meal per day, five days per week, and to take home food to eat for other meals. Each of the four clinics recruited 100 participants. Blood pressure was measured once a week during the first of three weeks and five times during the last week. During the final feeding period, fasting blood was collected and 24-hour urine collections were analyzed for magnesium, potassium. calcium, sodium, and creatinine.
DASH - Sodium determined, separately by race, gender, and hypertension status: 1) the effects on blood pressure of three levels of dietary sodium within the context of both a control diet and the DASH diet; 2) the effect on blood pressure of the DASH diet, relative to the control diet, at each of the three levels of sodium intake. The study also assessed whether the effect on blood pressure of going from higher to lower sodium diets differs for participants in the control and DASH diets. Lastly, the study determined whether the blood pressure effect associated with reducing sodium from the higher to the intermediate level differs from the blood pressure effect associated with reducing sodium from the intermediate to the lower level, that is, testing whether the blood pressure effects of sodium are linear across sodium levels for each diet.
Recruitment and screening began in August 1997. The first cohort began the experimental diets in January 1998 and the last cohort completed the diets in November 1999. A total of 412 participants were enrolled into the study. Results were presented at the annual meeting of American Society of Hypertension in May 2000.
The study was renewed under R01HL57114 to to analyze the data of the trial The hypothesis to be tested is that genetic makeup modulates the BP effects of DASH diet and reduced sodium intake through one or more of the following mechanisms: 1) effects on vascular tone; 2) effects on mineralocorticoid regulation of sodium homeostasis; and 3) effects on non-classical regulation of sodium homeostasis.
High blood pressure, defined as systolic blood pressure greater than or equal to 140 mm Hg or diastolic blood pressure greater than or equal to 90 mm Hg, or taking antihypertensive medication, affects 24 percent of the United States adult population or about 50 million people. Because the risk of cardiovascular disease and stroke increases with increasing blood pressure throughout the entire range of blood pressure levels, people with blood pressure above the optimal level of 120/80 are at increased risk of disease. Approximately 48 percent of the adult population have blood pressure either normal but above optimal levels or have Stage 1 hypertension, a prevalence which increases with age. To combat this highly prevalent condition, primary prevention through lifestyle modification represents a highly promising strategy for public health.
DASH - Sodium extended research from DASH trial to address several issues of relevance to clinical practice and public health and capitalized on the success of DASH by following the multicenter outpatient feeding study model. The model permitted a true test of efficacy because of high adherence and follow-up rates. In addition, the population studied across four geographic areas, encompassing individuals with diastolic blood pressure between 80-95 mm Hg and systolic blood pressure \<160 mm Hg, was broadly representative, thus making the results generalizable to a large portion of the United States population.
DESIGN NARRATIVE:
The effects on blood pressure of three levels of sodium intake and two dietary patterns were compared. The combined impact of sodium reduction with dietary intervention was evaluated as a potential non-pharmacologic treatment alternative to drug therapy for stage one hypertension or for maintaining normal blood pressure levels. The two dietary patterns were a control diet that represented the typical American diet and an intervention diet (DASH diet) that was high in fruits, vegetables, included whole grains, poultry, fish, and nuts, and reduced in fats, red meat, sweets, and sugar-containing beverages and dairy products. The three levels of sodium were higher (current United States intake), intermediate (current recommended levels), and lower (potentially optimal levels). Participants were assigned to one of the two dietary patterns using a parallel group design and were fed at each sodium level using a randomized cross-over design.
Three eligibility pre-screening visits were followed by a two-week run-in feeding period and then a four-week intervention period at each of three sodium levels. During the run-in for the intervention feeding periods, all food was provided to participants. They were required to attend the clinic for at least one meal per day, five days per week, and to take home food to eat for other meals. Each of the four clinics recruited 100 participants. Blood pressure was measured once a week during the first of three weeks and five times during the last week. During the final feeding period, fasting blood was collected and 24-hour urine collections were analyzed for magnesium, potassium. calcium, sodium, and creatinine.
DASH - Sodium determined, separately by race, gender, and hypertension status: 1) the effects on blood pressure of three levels of dietary sodium within the context of both a control diet and the DASH diet; 2) the effect on blood pressure of the DASH diet, relative to the control diet, at each of the three levels of sodium intake. The study also assessed whether the effect on blood pressure of going from higher to lower sodium diets differs for participants in the control and DASH diets. Lastly, the study determined whether the blood pressure effect associated with reducing sodium from the higher to the intermediate level differs from the blood pressure effect associated with reducing sodium from the intermediate to the lower level, that is, testing whether the blood pressure effects of sodium are linear across sodium levels for each diet.
Recruitment and screening began in August 1997. The first cohort began the experimental diets in January 1998 and the last cohort completed the diets in November 1999. A total of 412 participants were enrolled into the study. Results were presented at the annual meeting of American Society of Hypertension in May 2000.
The study was renewed under R01HL57114 to to analyze the data of the trial The hypothesis to be tested is that genetic makeup modulates the BP effects of DASH diet and reduced sodium intake through one or more of the following mechanisms: 1) effects on vascular tone; 2) effects on mineralocorticoid regulation of sodium homeostasis; and 3) effects on non-classical regulation of sodium homeostasis.
Conditions
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Cardiovascular Diseases
Heart Diseases
Hypertension
Vascular Diseases
Study Design
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Intervention Model
PARALLEL
Primary Study Purpose
PREVENTION
Interventions
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diet, fat-restricted
Intervention Type
BEHAVIORAL
diet, sodium-restricted
Intervention Type
BEHAVIORAL
Eligibility Criteria
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Inclusion Criteria
Healthy adult men and women, ages 22 and older, who had a diastolic blood pressure of 80 to 95 mm Hg and a systolic blood pressure less than 160 mm Hg.
Minimum Eligible Age
22 Years
Maximum Eligible Age
100 Years
Eligible Sex
ALL
Accepts Healthy Volunteers
No
Sponsors
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National Heart, Lung, and Blood Institute (NHLBI)
NIH
Sponsor Role
lead
Principal Investigators
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William Vollmer
Role:
Kaiser Foundation Research Institute
References
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Svetkey LP, Sacks FM, Obarzanek E, Vollmer WM, Appel LJ, Lin PH, Karanja NM, Harsha DW, Bray GA, Aickin M, Proschan MA, Windhauser MM, Swain JF, McCarron PB, Rhodes DG, Laws RL. The DASH Diet, Sodium Intake and Blood Pressure Trial (DASH-sodium): rationale and design. DASH-Sodium Collaborative Research Group. J Am Diet Assoc. 1999 Aug;99(8 Suppl):S96-104. doi: 10.1016/s0002-8223(99)00423-x.
Reference Type
BACKGROUND
Greenland P. Beating high blood pressure with low-sodium DASH. N Engl J Med. 2001 Jan 4;344(1):53-5. doi: 10.1056/NEJM200101043440109. No abstract available.
Reference Type
BACKGROUND
Sacks FM, Svetkey LP, Vollmer WM, Appel LJ, Bray GA, Harsha D, Obarzanek E, Conlin PR, Miller ER 3rd, Simons-Morton DG, Karanja N, Lin PH; DASH-Sodium Collaborative Research Group. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. DASH-Sodium Collaborative Research Group. N Engl J Med. 2001 Jan 4;344(1):3-10. doi: 10.1056/NEJM200101043440101.
Reference Type
BACKGROUND
Vollmer WM, Sacks FM, Ard J, Appel LJ, Bray GA, Simons-Morton DG, Conlin PR, Svetkey LP, Erlinger TP, Moore TJ, Karanja N; DASH-Sodium Trial Collaborative Research Group. Effects of diet and sodium intake on blood pressure: subgroup analysis of the DASH-sodium trial. Ann Intern Med. 2001 Dec 18;135(12):1019-28. doi: 10.7326/0003-4819-135-12-200112180-00005.
Reference Type
BACKGROUND
Phillips KM, Simpkins AH, Amanna KR, Wolf W, Stewart KK, Clark S, Kim KP, Beecher GR, Holden J. Long-term stability of nutrients in a frozen mixed food control material. Fresenius J Anal Chem. 2001 Jun;370(2-3):297-302. doi: 10.1007/s002160100785.
Reference Type
BACKGROUND
Conlin PR, Erlinger TP, Bohannon A, Miller ER 3rd, Appel LJ, Svetkey LP, Moore TJ. The DASH diet enhances the blood pressure response to losartan in hypertensive patients. Am J Hypertens. 2003 May;16(5 Pt 1):337-42. doi: 10.1016/s0895-7061(03)00056-6.
Reference Type
BACKGROUND
Lin PH, Aickin M, Champagne C, Craddick S, Sacks FM, McCarron P, Most-Windhauser MM, Rukenbrod F, Haworth L; Dash-Sodium Collaborative Research Group. Food group sources of nutrients in the dietary patterns of the DASH-Sodium trial. J Am Diet Assoc. 2003 Apr;103(4):488-96. doi: 10.1053/jada.2003.50065.
Reference Type
BACKGROUND
Erlinger TP, Miller ER 3rd, Charleston J, Appel LJ. Inflammation modifies the effects of a reduced-fat low-cholesterol diet on lipids: results from the DASH-sodium trial. Circulation. 2003 Jul 15;108(2):150-4. doi: 10.1161/01.CIR.0000080288.30567.86. Epub 2003 Jul 7.
Reference Type
BACKGROUND
Akita S, Sacks FM, Svetkey LP, Conlin PR, Kimura G; DASH-Sodium Trial Collaborative Research Group. Effects of the Dietary Approaches to Stop Hypertension (DASH) diet on the pressure-natriuresis relationship. Hypertension. 2003 Jul;42(1):8-13. doi: 10.1161/01.HYP.0000074668.08704.6E. Epub 2003 May 19.
Reference Type
BACKGROUND
Jurgens G, Graudal N; Dietary Approaches to Stop Hypertension. Subgroup results in the DASH-sodium trial. Ann Intern Med. 2002 Nov 5;137(9):772-3; author reply 772-3. doi: 10.7326/0003-4819-137-9-200211050-00018. No abstract available.
Reference Type
BACKGROUND
Harsha DW, Sacks FM, Obarzanek E, Svetkey LP, Lin PH, Bray GA, Aickin M, Conlin PR, Miller ER 3rd, Appel LJ. Effect of dietary sodium intake on blood lipids: results from the DASH-sodium trial. Hypertension. 2004 Feb;43(2):393-8. doi: 10.1161/01.HYP.0000113046.83819.a2. Epub 2004 Jan 5.
Reference Type
BACKGROUND
Most MM, Craddick S, Crawford S, Redican S, Rhodes D, Rukenbrod F, Laws R; Dash-Sodium Collaborative Research Group. Dietary quality assurance processes of the DASH-Sodium controlled diet study. J Am Diet Assoc. 2003 Oct;103(10):1339-46. doi: 10.1016/s0002-8223(03)01080-0.
Reference Type
BACKGROUND
Obarzanek E, Proschan MA, Vollmer WM, Moore TJ, Sacks FM, Appel LJ, Svetkey LP, Most-Windhauser MM, Cutler JA. Individual blood pressure responses to changes in salt intake: results from the DASH-Sodium trial. Hypertension. 2003 Oct;42(4):459-67. doi: 10.1161/01.HYP.0000091267.39066.72. Epub 2003 Sep 2.
Reference Type
BACKGROUND
Bray GA, Vollmer WM, Sacks FM, Obarzanek E, Svetkey LP, Appel LJ; DASH Collaborative Research Group. A further subgroup analysis of the effects of the DASH diet and three dietary sodium levels on blood pressure: results of the DASH-Sodium Trial. Am J Cardiol. 2004 Jul 15;94(2):222-7. doi: 10.1016/j.amjcard.2004.03.070.
Reference Type
BACKGROUND
Svetkey LP, Simons-Morton DG, Proschan MA, Sacks FM, Conlin PR, Harsha D, Moore TJ. Effect of the dietary approaches to stop hypertension diet and reduced sodium intake on blood pressure control. J Clin Hypertens (Greenwich). 2004 Jul;6(7):373-81. doi: 10.1111/j.1524-6175.2004.03523.x.
Reference Type
BACKGROUND
Ard JD, Coffman CJ, Lin PH, Svetkey LP. One-year follow-up study of blood pressure and dietary patterns in dietary approaches to stop hypertension (DASH)-sodium participants. Am J Hypertens. 2004 Dec;17(12 Pt 1):1156-62. doi: 10.1016/j.amjhyper.2004.07.005.
Reference Type
BACKGROUND
Kennedy BM, Conlin PR, Ernst D, Reams P, Charleston JB, Appel LJ. Successfully recruiting a multicultural population: the DASH-Sodium experience. Ethn Dis. 2005 Winter;15(1):123-9.
Reference Type
BACKGROUND
Kim H, Lichtenstein AH, Coresh J, Appel LJ, Rebholz CM. Serum proteins associated with LDL-C and non-HDL-C reduction in response to dietary interventions in the DASH and DASH-Sodium trials. Food Funct. 2025 Oct 27. doi: 10.1039/d5fo02593a. Online ahead of print.
Reference Type
DERIVED
Kim H, Appel LJ, Lichtenstein AH, Wong KE, Chatterjee N, Rhee EP, Rebholz CM. Metabolomic Profiles Associated With Blood Pressure Reduction in Response to the DASH and DASH-Sodium Dietary Interventions. Hypertension. 2023 Jul;80(7):1494-1506. doi: 10.1161/HYPERTENSIONAHA.123.20901. Epub 2023 May 10.
Reference Type
DERIVED
Kim H, Lichtenstein AH, Ganz P, Du S, Tang O, Yu B, Chatterjee N, Appel LJ, Coresh J, Rebholz CM. Identification of Protein Biomarkers of the Dietary Approaches to Stop Hypertension Diet in Randomized Feeding Studies and Validation in an Observational Study. J Am Heart Assoc. 2023 Apr 4;12(7):e028821. doi: 10.1161/JAHA.122.028821. Epub 2023 Mar 28.
Reference Type
DERIVED
Belanger MJ, Kovell LC, Turkson-Ocran RA, Mukamal KJ, Liu X, Appel LJ, Miller ER 3rd, Sacks FM, Christenson RH, Rebuck H, Chang AR, Juraschek SP. Effects of the Dietary Approaches to Stop Hypertension Diet on Change in Cardiac Biomarkers Over Time: Results From the DASH-Sodium Trial. J Am Heart Assoc. 2023 Jan 17;12(2):e026684. doi: 10.1161/JAHA.122.026684. Epub 2023 Jan 11.
Reference Type
DERIVED
Juraschek SP, Kovell LC, Appel LJ, Miller ER 3rd, Sacks FM, Chang AR, Christenson RH, Rebuck H, Mukamal KJ. Effects of Diet and Sodium Reduction on Cardiac Injury, Strain, and Inflammation: The DASH-Sodium Trial. J Am Coll Cardiol. 2021 Jun 1;77(21):2625-2634. doi: 10.1016/j.jacc.2021.03.320.
Reference Type
DERIVED
Chaudhary P, Velkoska E, Wainford RD. An exploratory analysis of comparative plasma metabolomic and lipidomic profiling in salt-sensitive and salt-resistant individuals from The Dietary Approaches to Stop Hypertension Sodium Trial. J Hypertens. 2021 Oct 1;39(10):1972-1981. doi: 10.1097/HJH.0000000000002904.
Reference Type
DERIVED
Kim H, Lichtenstein AH, Wong KE, Appel LJ, Coresh J, Rebholz CM. Urine Metabolites Associated with the Dietary Approaches to Stop Hypertension (DASH) Diet: Results from the DASH-Sodium Trial. Mol Nutr Food Res. 2021 Feb;65(3):e2000695. doi: 10.1002/mnfr.202000695. Epub 2020 Dec 28.
Reference Type
DERIVED
Juraschek SP, Miller ER 3rd, Chang AR, Anderson CAM, Hall JE, Appel LJ. Effects of Sodium Reduction on Energy, Metabolism, Weight, Thirst, and Urine Volume: Results From the DASH (Dietary Approaches to Stop Hypertension)-Sodium Trial. Hypertension. 2020 Mar;75(3):723-729. doi: 10.1161/HYPERTENSIONAHA.119.13932. Epub 2020 Jan 20.
Reference Type
DERIVED
Peng AW, Juraschek SP, Appel LJ, Miller ER 3rd, Mueller NT. Effects of the DASH Diet and Sodium Intake on Bloating: Results From the DASH-Sodium Trial. Am J Gastroenterol. 2019 Jul;114(7):1109-1115. doi: 10.14309/ajg.0000000000000283.
Reference Type
DERIVED
Peng AW, Appel LJ, Mueller NT, Tang O, Miller ER 3rd, Juraschek SP. Effects of sodium intake on postural lightheadedness: Results from the DASH-sodium trial. J Clin Hypertens (Greenwich). 2019 Mar;21(3):355-362. doi: 10.1111/jch.13487. Epub 2019 Jan 28.
Reference Type
DERIVED
Juraschek SP, Miller ER 3rd, Weaver CM, Appel LJ. Effects of Sodium Reduction and the DASH Diet in Relation to Baseline Blood Pressure. J Am Coll Cardiol. 2017 Dec 12;70(23):2841-2848. doi: 10.1016/j.jacc.2017.10.011. Epub 2017 Nov 12.
Reference Type
DERIVED
Juraschek SP, Woodward M, Sacks FM, Carey VJ, Miller ER 3rd, Appel LJ. Time Course of Change in Blood Pressure From Sodium Reduction and the DASH Diet. Hypertension. 2017 Nov;70(5):923-929. doi: 10.1161/HYPERTENSIONAHA.117.10017.
Reference Type
DERIVED
Derkach A, Sampson J, Joseph J, Playdon MC, Stolzenberg-Solomon RZ. Effects of dietary sodium on metabolites: the Dietary Approaches to Stop Hypertension (DASH)-Sodium Feeding Study. Am J Clin Nutr. 2017 Oct;106(4):1131-1141. doi: 10.3945/ajcn.116.150136. Epub 2017 Aug 30.
Reference Type
DERIVED
Juraschek SP, Choi HK, Tang O, Appel LJ, Miller ER 3rd. Opposing effects of sodium intake on uric acid and blood pressure and their causal implication. J Am Soc Hypertens. 2016 Dec;10(12):939-946.e2. doi: 10.1016/j.jash.2016.10.012. Epub 2016 Nov 11.
Reference Type
DERIVED
Juraschek SP, Gelber AC, Choi HK, Appel LJ, Miller ER 3rd. Effects of the Dietary Approaches to Stop Hypertension (DASH) Diet and Sodium Intake on Serum Uric Acid. Arthritis Rheumatol. 2016 Dec;68(12):3002-3009. doi: 10.1002/art.39813.
Reference Type
DERIVED
Amer M, Woodward M, Appel LJ. Effects of dietary sodium and the DASH diet on the occurrence of headaches: results from randomised multicentre DASH-Sodium clinical trial. BMJ Open. 2014 Dec 11;4(12):e006671. doi: 10.1136/bmjopen-2014-006671.
Reference Type
DERIVED
Sun B, Williams JS, Svetkey LP, Kolatkar NS, Conlin PR. Beta2-adrenergic receptor genotype affects the renin-angiotensin-aldosterone system response to the Dietary Approaches to Stop Hypertension (DASH) dietary pattern. Am J Clin Nutr. 2010 Aug;92(2):444-9. doi: 10.3945/ajcn.2009.28924. Epub 2010 Jun 2.
Reference Type
DERIVED
Other Identifiers
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111
Identifier Type: -
Identifier Source: org_study_id
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