Effects of Black Tea Intake on Serum Lipids

Not Applicable

Completed

• Conditions: Hypercholesterolemia
• Interventions: Dietary Supplement: Tea Treatment Group; Dietary Supplement: Placebo

• Registration Number: NCT01882283
• Lead Sponsor: University of Minnesota

Brief Summary

A diet-controlled clinical trial which attempts to provide estimates of the effect of black tea consumption on serum lipids under tightly controlled conditions, including a controlled diet. Mildly hypercholesterolemic individuals (total cholesterol levels between 4.9 and 6.7 mmol/L, 190 and 260 mg/dl), non-smoking, chronic disease-free individuals were enrolled in a 15-week, double blind, randomized crossover trial, during which they consumed a controlled low-flavonoid diet plus 5 cups of black tea or a tea-like placebo over two 4-week treatment periods.

Detailed Description

Not available

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2002-04
• Primary Completion: 2004-04
• Study Completion: 2004-04
• Study First Submitted: 2013-06-17
• Study First Submitted QC: 2013-06-17
• Study First Posted: 2013-06-20
• Status Verified: 2019-05
• Last Update Submitted: 2019-05-03
• Last Update Posted: 2019-05-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 57

Inclusion Criteria

• between 45-65 years old
• mildly hypercholesterolemic (total cholesterol levels between 4.9 and 6.7 mmol/L, 190 and 260 mg/dl)
• high-density lipoprotein cholesterol (HDL-C) between 0.9 and 1.6 mmol/L (35 and 65 mg/dl)
• triglyceride (TG) concentrations below 6.8 mmol/L (600 mg/dl)
• habitually consumed a typical American diet with low dietary flavonoid intake (<4 one-half cup servings of fruits and vegetables/day) and low intake (<1 serving/day) of soy-rich foods, nuts, herbs, and spices (besides salt and pepper)
• aspartate aminotransferase (AST) between 0 and 55 mg/L
• creatinine between 70.7 and 150.3 mmol/L (0.8 and 1.7 mg/dl)
• glucose between 3.3 and 6.4 mmol/L (60 and 115 mg/dl)

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Exclusion Criteria

• current smoker
• usage of high amounts of antioxidant vitamin supplements (>3 times the Recommended Dietary Allowance (RDA) of vitamins E, C, and selenium, or >10 mg/day of beta carotene)
• had been diagnosed with diabetes, coagulation disorders, chronic pulmonary disease, current active malignancy, renal disease requiring dialysis, malabsorption, or gastrointestinal disorders, or had a history of cardiovascular disease.
• antihypertensive, immunosuppressive, cholesterol lowering, or anticoagulant medications
• consuming >3 servings of alcohol daily
• Pre-menopausal (women)

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Tea Treatment Group	Tea Treatment Group	5 cups brewed tea beverage per day for 28 days, brewed from 700 mg of black tea solids per cup
Placebo Group	Placebo	5 cups tea-like placebo per day for 28 days. Placebo was exactly matched to tea except for flavonoid composition. Placebo was flavonoid-free.

Primary Outcome Measures

Name	Time	Method
Serum lipid levels	4 weeks	Serum lipid levels (total cholesterol, LDL-C, HDL-C, triglycerides, LDL-C+HDL-C fraction, LDL-C/HDL-C ratio) were assessed at the end of a 28-day treatment period

Trial Locations

Locations (1)

General Clinical Research Center, University of Minnesota; 🇺🇸 Minneapolis, Minnesota, United States