The purpose of this study is to compare the effect of dark chocolate with green tea in
healthy subjects on clot formation (platelet activity) cholesterol profile and markers of
inflammation in two groups.
The first group will be on a regimen of dark chocolate, and the second group will be on a
regimen of green tea. Clinical outcomes will be determined after seven days of each
treatment and both groups will undergo both treatments subsequently and serve as their own
The hypothesis is that both green tea and dark chocolate will reduce platelet activity and
reduce LDL, hsCRP and increase HDL.
Flavonoids are polyphenolic compounds ubiquitous in fruits and vegetables. They appear in
especially high concentrations in the form of flavanols in green tea as well as in cocoa,
and are known to have beneficial antioxidant effects in vitro. Flavonoids have been proposed
as a key protective dietary component, reducing the risk of coronary heart disease,
including the reduction of elevated blood pressure in persons with hypertension and capable
of decreasing LDL.
The aim of this prospective single cross-over study is to assess the effect of green tea and
dark chocolate consumption on inhibiting platelet activation, Lipid levels, and hsCRP in
This research will be done at Sinai Hospital of Baltimore and will include 35 subjects who
will be randomized equally between the two groups.
All blood work will be processed at the Sinai Center for Thrombosis Research. Clinical
outcomes will be recorded using a standard case report form.
- non-smokers between the ages of 18-60
- BMI of 19 to 30
- prior usage of Vitamin C > 1000 mg, Vitamin E > 400IU, Beta Carotene > 1000IU,
Vitamin A > 5000IU, Selenium > 200mcg, Folic Acid > 1mg, Aspirin or NSAIDs four weeks
prior to study initiation
- regular ingestion of Flavonoid rich food (EG green tea, dark chocolate, grapes, red
wine and others) prior and during the study except what was provided by the study
- Alcohol or Caffeine consumption 24 prior to blood draws
- Nursing or pregnant women
- blood donation up to eight weeks prior to study initiation
- subjects with coagulation disorders
- known cardiovascular disease (prior myocardial infarction)
- drug abuse