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Is eating cocoa powder good for you?
There should be no problem with consuming the three teaspoons of unsweetened cocoa powder. There has been a lot of research that indicates the antioxidants including polyphenols and flavonoids are very beneficial.

Would a hot chocolate mix offer the same benefits as hot cocoa?
I put this cautionary statement in the conclusion because many hot chocolate products have very little actual cocoa in them. They will often be milk powder combined with artificial chocolate or cocoa flavorings. Because the study was done with real cocoa products, simply saying "hot chocolate" might not offer the same benefit.

Hot Chocolate for High Blood Pressure?
It's a good idea for those with high blood pressure to make sure they're getting enough fruits and vegetables in their diet. Not just for overall health, but because the polyphenols, or flavonoids, in fruits and vegetables have been linked with reduced blood pressure and lower risk of heart disease. Yet the foods with the largest amounts of polyphenols are not foods at all but beverages - tea and cocoa.

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Yet that last study about hot chocolate was a meta-analysis: a grouping
of results of other studies. A new study performed in Spain (the
same country that brought you studies about beer-drinking nuns:
Alcohol-Free Beer: an Antioxidant?)
focused on the effects of cocoa on heart disease (Am
J Clin Nutr 2009;90(5):1144-50). Or more specifically, on the biomarkers of the
inflammatory response which leads to heart disease.

They recruited 42 men and women who were considered to be at high risk
of heart disease. They were all over 55 years of age and had at least three
of the following risk factors for heart disease: current smokers, high
blood pressure, high LDL cholesterol (the bad guys), low HDL cholesterol
(the good guys), obesity and family members with heart disease. The participants
were randomly assigned to one of two groups in what is known as a crossover
study. For the first four weeks, one group had two cups of hot cocoa made
with milk each day, while the other group had two cups of milk alone. Then
the two groups switched and continued for an additional four weeks.

The researchers instructed the participants to avoid other foods containing
cocoa and limit foods containing flavonoids, including tea, coffee, wine
and olive oil. Blood pressure measurements, along with blood tests, were
taken before and after each four-week period of the study, then compared.

While the volunteers did gain an average of a pound over the eight weeks;
that's likely due to the additional calories in the hot cocoa and milk,
even though skim milk was used. Their blood pressures, however, were unchanged,
as were their total and LDL cholesterols. Their HDL cholesterols did improve
during the hot chocolate portion of the study – not a lot, but a clinically
significant amount nonetheless. Most importantly: the biomarkers of that
initial phase of artherosclerosis (heart disease) were indeed significantly
reduced.

What this means for you

This is a very small study, but well designed. The take-home message
here is that those flavonoids can help slow the progression of heart disease.
While cocoa is a good source of flavonoids, so is tea, wine and coffee
– and coffee, without milk or sugar, has virtually no calories. In this
holiday season, keep in mind that cocoa and wine, while good for your heart,
contain calories: about 230 for a typical cup of cocoa using the instructions
on the back of the cocoa box, and about 100 for a glass of wine.