Document Detail


Ascorbic acid, blood pressure, and the American diet.
MedLine Citation:
PMID:  11976195     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A large controlled study supported by the NIH, the DASH study (Dietary Approaches to Stop Hypertension), demonstrated that a diet rich in fruits and vegetables can reduce blood pressure in persons with moderate elevation in blood pressure (BP). Fruits and vegetables are important sources of antioxidants such as vitamin C and carotenoids. We conducted a study in which we fed people a diet deficient in vitamin C for 30 days, followed for another 30 days by a diet adequate in vitamin C. Their blood levels of vitamin C and blood pressure (BP) were tracked. Plasma vitamin C was inversely related to diastolic blood pressure one month later (correlation = -0.48, P < 0.0001). Persons whose blood levels of vitamin C went down the furthest on depletion had the highest blood pressure one month later. Persons in the lowest one-fourth of the plasma vitamin C distribution had diastolic BP 7 mm Hg higher than did those in the upper one-fourth of the plasma ascorbic acid distribution. Multivariate control for age, body mass index, other plasma antioxidants, and dietary energy, calcium, fiber, sodium, and potassium did not reduce the plasma vitamin C effect. We believe that this indicates that the tissue stores of vitamin C may be important in regulating blood pressure. It is often thought that Americans' intake of vitamin C is ample, since the average intake is about 100 mg/day. However, this average level obscures the fact that substantial numbers of people actually have habitually low intake levels and low blood levels. African Americans tend to have low blood levels of vitamin C as well as the highest risk of hypertension. Low intake of antioxidant-rich fruits and vegetables may be one of the causes of hypertension.
Authors:
Gladys Block
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Annals of the New York Academy of Sciences     Volume:  959     ISSN:  0077-8923     ISO Abbreviation:  Ann. N. Y. Acad. Sci.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-04-26     Completed Date:  2002-06-04     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7506858     Medline TA:  Ann N Y Acad Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  180-7     Citation Subset:  IM    
Affiliation:
School of Public Health, University of California, Berkeley, California 94720, USA. gblock@uclink4.berkeley.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Ascorbic Acid / blood*
Blood Pressure / physiology*
Diet*
Humans
Male
Middle Aged
Statistics as Topic
United States
Chemical
Reg. No./Substance:
50-81-7/Ascorbic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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