The overall purpose of our research is to establish how different dietary patterns affect antioxidant capacity and free-radical mediated cellular damage. In a clinical trial, human volunteers are randomized to one of three diets that vary in fat content and amounts of fruits and vegetables. Free-radical mediated damage is assessed with measures of lipid peroxidation and is related to the antioxidant capacity of the blood. Our research has been conducted as an ancillary study within the context of an NHLBI-sponsored clinical trial entitled Dietary Approach to Stop Hypertension. The design of the study is a randomized, placebo- controlled clinical trial. Volunteer participants with borderline to mild hypertension, and no other concomitant disease, are eligible for this study. The trial was designed to look at the effects of diets that vary in fat content and the amounts of fruits and vegetables on blood pressure. Patients who are interested and eligible are all placed for three weeks on a diet that is 37% fat and is low in fruits and vegetables. After three weeks, patients were randomized to one of three diets, either the baseline diet, a diet that is low in fat (25%) and high in fruits and vegetables, or on a diet that has 37% fat but is high in fruits and vegetables. The main outcome variable for the trial is blood pressure measurements. The objective of our ancillary study is to determine the effects of diet on measures of the precursors of atherosclerosis, including the collection and analysis of breath ethane and serum to determine the extent of lipid peroxidation. Our hypothesis is that diets high in fruits and vegetables which have an abundance of exogenous antioxidants, are protective against free-radical mediated damage as reflected by peroxidation of lipids.. Outcome variables will also be correlated with baseline atherosclerotic cardiovascular disease risk factors. In June of 1996, we completed the last of our five cohorts. There was a tremendous effort in recruitment, which was highly successful. We enrolled and sampled 123 participants overall, 35 in the last cohort during the most recent fiscal year. These numbers exceed our a priori expectations, on which we based our power calculations. Hence we have completed data collection, and we are currently performing data analysis that to date has resulted in one submitted publication and one in preparation.

Project Start
Project End
Budget Start
1995-10-01
Budget End
1996-09-30
Support Year
24
Fiscal Year
1996
Total Cost
Indirect Cost
Name
Johns Hopkins University
Department
Type
DUNS #
045911138
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Tipton, Laura; Cuenco, Karen T; Huang, Laurence et al. (2018) Measuring associations between the microbiota and repeated measures of continuous clinical variables using a lasso-penalized generalized linear mixed model. BioData Min 11:12
Juraschek, Stephen P; Woodward, Mark; Sacks, Frank M et al. (2017) Time Course of Change in Blood Pressure From Sodium Reduction and the DASH Diet. Hypertension 70:923-929
Anderegg, Nanina; Johnson, Leigh F; Zaniewski, Elizabeth et al. (2017) All-cause mortality in HIV-positive adults starting combination antiretroviral therapy: correcting for loss to follow-up. AIDS 31 Suppl 1:S31-S40
Tang, Olive; Miller 3rd, Edgar R; Gelber, Allan C et al. (2017) DASH diet and change in serum uric acid over time. Clin Rheumatol 36:1413-1417
Juraschek, Stephen P; Miller 3rd, Edgar R; Weaver, Connie M et al. (2017) Effects of Sodium Reduction and the DASH Diet in Relation to Baseline Blood Pressure. J Am Coll Cardiol 70:2841-2848
Segal, Leopoldo N; Clemente, Jose C; Tsay, Jun-Chieh J et al. (2016) Enrichment of the lung microbiome with oral taxa is associated with lung inflammation of a Th17 phenotype. Nat Microbiol 1:16031
Aziz, Najib; Detels, Roger; Quint, Joshua J et al. (2016) Stability of cytokines, chemokines and soluble activation markers in unprocessed blood stored under different conditions. Cytokine 84:17-24
Cribbs, Sushma K; Uppal, Karan; Li, Shuzhao et al. (2016) Correlation of the lung microbiota with metabolic profiles in bronchoalveolar lavage fluid in HIV infection. Microbiome 4:3
Juraschek, Stephen P; Gelber, Allan C; Choi, Hyon K et al. (2016) Effects of the Dietary Approaches to Stop Hypertension (DASH) Diet and Sodium Intake on Serum Uric Acid. Arthritis Rheumatol 68:3002-3009
Aziz, Najib; Detels, Roger; Chang, L Cindy et al. (2016) Macrophage Inflammatory Protein-3 Alpha (MIP-3?)/CCL20 in HIV-1-Infected Individuals. J AIDS Clin Res 7:

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