Nov. 13, 2009 -- Those stress-induced chocolate cravings may be justified
after all. A new study shows that eating dark chocolate may lower levels of
stress hormones in people feeling stressed out.
Researchers found that eating the equivalent of one average-sized dark
chocolate candy bar (1.4 ounces) each day for two weeks reduced levels of the
stress hormone cortisol as well as the “fight-or-flight” hormones known as
catecholamines in highly stressed people.
The findings add to a growing number of recently discovered potential health
benefits of dark chocolate. For example, cocoa has been found to be rich in a
class of antioxidants called flavonoids, which have been linked to a number of
Researchers are also investigating other compounds in dark chocolate that
may offer other health benefits, such as improved insulin sensitivity, reduced
blood pressure, and improved mood.
In the study, researchers looked at the effects of eating 1.4 ounces (40
grams) of dark chocolate every day for two weeks on blood and urine measures of
stress in 30 healthy adults. Half of the chocolate was eaten midmorning and the
other half was eaten midafternoon.
The participants’ anxiety levels were determined at the start of the study,
and blood and urine samples were collected and analyzed at the beginning and
end of the two-week study.
The results showed that eating dark chocolate daily reduced stress hormone
levels in those who had high anxiety levels.
Researchers also say dark chocolate appeared to have beneficial effects on
the participants’ metabolism and microbial activity in the gut.
The study appears in the Journal of Proteome Research and was
conducted by researchers at the Nestle Research Center in Lausanne,