U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Northeast Area Beltsville, Maryland (BHNRC) Beltsville Human Nutrition Research Center Food Components and Health Laboratory Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Harris, Gabrielitem
                                            Baer, Daviditem
                                            Clevidence, Beverly
  Submitted to: International Symposium on Biocatalysis and Biotechnology:  Functional Food and Industrial Products
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 6/28/2006
                                    Publication  Date: 7/28/2006
                                    Citation: Harris, G.K., Baer, D.J., Clevidence, B.A. 2006. The effects of black tea on blood lipids and cardiovascualr disease risk in humans. International Symposium on Biocatalysis and Biotechnology:  Functional Food and Industrial Products.Interpretive Summary: Habitual intake of tea is widely believed to protect against cardiovascular disease due antioxidant and anti-inflammatory effects, improved vascular endothelial function, and reduced blood lipid concentrations. Yet few clinical trials have been conducted to determine the effects of black tea, the most widely consumed type of tea worldwide, on risk factors for cardiovascular disease. Thus, we assessed the effects of black tea consumption on lipid and lipoprotein concentrations and antioxidant status in mildly hypercholesterolemic adults (7 men and 8 women).  Subjects consumed 5 servings of tea or a caffeine-free placebo beverage while consuming a controlled diet that maintained body weight.  Treatments, blinded to subjects and investigators, were administered for 3 wk each in a crossover design.  In a third period, caffeine was added to the placebo in an amount equal to that in the tea.  Compared to the placebo beverage that contained no caffeine, tea consumption reduced total cholesterol 3.8% and LDL cholesterol 7.5%.  Measures of oxidative status were unchanged. Thus black tea, as part of a healthy diet, reduces total and LDL cholesterol in mildly hypercholesterolemic adults by biologically significant amounts, and thus may reduce the risk of coronary heart disease.  Black tea consumption did not affect measures of antioxidant status.
                                Technical Abstract: Habitual intake of tea is widely believed to protect against cardiovascular disease due antioxidant and anti-inflammatory effects, improved vascular endothelial function, and reduced blood lipid concentrations. Yet few clinical trials have been conducted to determine the effects of black tea, the most widely consumed type of tea worldwide, on risk factors for cardiovascular disease. Thus, we assessed the effects of black tea consumption on lipid and lipoprotein concentrations and antioxidant status in mildly hypercholesterolemic adults (7 men and 8 women).  Subjects consumed 5 servings of tea or a caffeine-free placebo beverage while consuming a controlled diet that maintained body weight.  Treatments, blinded to subjects and investigators, were administered for 3 wk each in a crossover design.  In a third period, caffeine was added to the placebo in an amount equal to that in the tea.  Compared to the placebo beverage that contained no caffeine, tea consumption reduced total cholesterol 3.8% and LDL cholesterol 7.5% whereas apolipoprotein B, lipoprotein(a), HDL cholesterol, apolipoprotein A-I and triglycerides were unchanged.   Compared to the placebo beverage with caffeine, tea consumption reduced total cholesterol 6.5%, LDL cholesterol 11.1%, apolipoprotein B 5% and lipoprotein(a) 16.4%.  Measures of oxidative status were unchanged and included oxidized LDL, F2-isoprostanes, urinary 8-hydroxy-2’-deoxyguanosine, ex vivo ferric ion reducing capacity and thiobarbituric acid reactive substances in LDL.  Thus black tea, as part of a healthy diet, reduces total and LDL cholesterol in mildly hypercholesterolemic adults by biologically significant amounts, and thus may reduce the risk of coronary heart disease.  Black tea consumption did not affect measures of antioxidant status.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov