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CompletedNCT00538083ChocolateUpdated Mar 26, 2020

Cocoa and Endothelial Function in Adults With Elevated BMI

A Phase 1 interventional study of Chocolate and Chocolate in Cardioprotection, sponsored by Griffin Hospital. Completed at 1 site in United States. Open to participants aged 30 Years to 75 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2020-03-26.

Sponsored by Griffin Hospital · Phase 1, Interventional, and Prevention

Phase
Phase 1
Study type
Interventional
Enrollment
45
Allocation
Randomized
Ages
30 Years to 75 Years
Sex
All
01

Study summary

Cardiovascular disease is the leading cause of death in the United States. Studies have shown that obesity is an important risk factor for development of cardiovascular disease. Endothelial dysfunction, a pathologic feature of obesity, predicts the occurrence of cardiovascular disease. Recent research findings indicate that consumption of cocoa exerts cardioprotective effects, which include increasing HDL levels, reduction in systolic BP, inhibition of platelet aggregation/activity and activation of endothelial nitric oxide synthase.

Proposed is a randomized controlled trial consisting of 4 phases designed to examine the dose-response, and the acute and sustained effects of cocoa consumption on endothelial function as a marker of cardiovascular disease risk in 45 otherwise healthy adults with a BMI 25-35kg/m2.

Read the detailed description

Endothelial function has been used extensively to evaluate the acute and chronic effects of foods and nutrients on cardiac risk and can provide a direct measurement of the effect of cocoa powder consumption on vascular physiology in healthy adults with BMI between 25-35 kg/m2.

To our knowledge, our study is the first to examine the dose response effects of sugar free, liquid, cocoa and solid, dark chocolate with sugar consumption on FMD, concentrating on individuals with elevated BMI. Given the current epidemic of obesity in the United States; its role as a risk factor in the development of cardiovascular disease; and the fact that cardiovascular disease is the leading cause of mortality in this country, examination of the cardio-protective effects of cocoa or dark chocolate in an at risk population is of considerable potential interest. Demonstrating that ingestion of cocoa may reverse damage caused to the endothelium may lead to new dietary recommendations that may help curb the prevalence of heart disease in the U.S.

02

Conditions studied

  • Cardioprotection

Keywords

  • Cocoa
  • Overweight adults
  • Endothelial function
  • Blood pressure
  • Cardiovascular disease risk
  • Dark chocolate
  • Sugar
03

In context

Lead sponsor

Griffin Hospital is the lead sponsor of 25 studies on the registry; 1 is open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
30 Years to 75 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Ages between 30 -75
  • BMI between 25-35 kg/m2
  • waist circumference above 88 cms. in women and 102 cms. in men
  • non-smoker
  • no strenuous exercise at least 8 hours prior to scanning
  • to facilitate recruitment individuals with diagnosed hypertension or hyperlipidemia will be included provided that they have been stable on their medications for three months, and can refrain from taking their medication 12 hours prior to BARS testing.

Exclusion criteria

Exclusion Criteria:

  • Failure to meet inclusion criteria
  • anticipated inability to complete study protocol for any reason
  • current eating disorder
  • diagnosed coronary artery disease
  • diabetes
  • sleep apnea
  • current or impending pregnancy
  • insulin or glucose sensitizing medication use, vasoactive medication or nutriceutical use (glucocorticoids, antineoplastic agents, psychoactive agents, or bronchodilators)
  • regular use of high dose vitamin E or C and unable to discontinue for duration of the study
  • regular use of fiber supplements and unable to discontinue for duration of the study
  • restricted diets by choice (i.e. vegan, Atkins diet etc)
  • allergy to cocoa or chocolate.
05

Study design

Phase
Phase 1
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Crossover assignment
Masking
Single (Investigator)
Enrollment
45 participants (actual)

Study arms

  • Experimental
    1, 2

    acute phase, solid dark chocolate, placebo

    Other: Chocolate

  • Experimental
    3, 4, 5

    acute phase, sugared cocoa, sugar-free cocoa, placebo

    Other: Chocolate

  • Experimental
    6, 7, 8

    sustained phase, sugared cocoa, sugar-free cocoa, placebo

    Other: Chocolate

Interventions

  • OtherChocolate

    74 grams of single dose solid dark chocolate versus placebo

  • OtherChocolate

    22 grams of single dose sugared cocoa, sugar-free cocoa, and placebo

  • OtherChocolate

    22 grams of sugared cocoa, sugar-free cocoa, \& placebo given for six weeks

06

What researchers measure

Primary outcomes

  1. Endothelial Function(acute & sustained phase)

    Time frame: Single dose(acute phase), 6 weeks (sustained phase)

Secondary outcomes

  1. Blood Pressure(acute and sustained phase), lipid profile(sustained), LDL oxidation(sustained), lipid hydroperoxide(sustained), CRP(sustained), blood glucose(sustained), body weight(sustained), waist circumference(sustained), endothelin(sustained)

    Time frame: Single dose(acute phase), 6 weeks(sustained phase)

07

Study locations

1 site
  • Griffin Hospital
    Derby, Connecticut 06418, United States
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Mar 26, 2020, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT00538083
Lead sponsor
Griffin Hospital
Collaborators
Centers for Disease Control and Prevention, The Hershey Company
First posted
Oct 2, 2007
Start date
Aug 2005
Completion
May 2006
Last update
Mar 26, 2020

Study contacts

David L Katz, MD
principal investigator · Yale-Griffin Prevention Research Center
Zubaida Faridi, MPH
study director · Yale-Griffin Prevention Research Center

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Mar 2020. You cannot join it, but the record below documents what was studied.

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