Here's some good and bad news for chocoholics: Dark chocolate
seems to lower blood pressure, but it requires an amount less than
two Hershey's Kisses to do it, a small study suggests. The new
research from Germany adds to mounting evidence linking dark
chocolate with health benefits, but it's the first to suggest that
just a tiny amount may suffice.
Volunteers for the study ate just over 6 grams of dark chocolate
daily for almost five months - one square from a German chocolate
bar called Ritter Sport, equal to about 1 1/2 Hershey's Kisses.
People who ate that amount ended up with lower blood pressure
readings than those who ate white chocolate.
University of Cologne researcher Dr. Dirk Taubert, the study's
lead author, said the blood pressure reductions with dark chocolate
were small but still substantial enough to potentially reduce
cardiovascular disease risks, although study volunteers weren't
followed long enough to measure that effect.
The research involved just 44 people aged 56 through 73, but the
results echo other small studies of cocoa-containing foods. Cocoa
contains flavanols, plant-based compounds that also are credited
with giving red wine its heart-healthy benefits.
One problem is chocolate bars containing cocoa tend to have lots
of calories, so Taubert and his colleagues tested small amounts
containing just 30 calories each.
The study appears in Wednesday's Journal of the American
Medical Association. It was funded by University Hospital in
Cologne.
The results are interesting but need to be duplicated in larger,
more ethnically diverse populations, said Dr. Laura Svetkey,
director of Duke University's Hypertension Center.
She stressed that the study results should not be viewed as
license to gorge on chocolate.
"I would be as happy as the next person if I got to eat more
chocolate," she said, but cautioned that weight gain from eating
large amounts of dark chocolate would counteract any benefits on
blood pressure.
Study participants were otherwise healthy and mostly
normal-weight German adults with mild high blood pressure or
pre-hypertension, which includes readings between 120 over 80 and
139 over 89.
Average blood pressure at the start was about 147 over 86.
Every day for 18 weeks, the volunteers were instructed to eat
one-square portions of a 16-square Ritter Sport bar, or a similar
portion of white chocolate. White chocolate doesn't contain
cocoa.
Systolic blood pressure, the top number, fell an average of
nearly three points and diastolic dropped almost two points in the
dark chocolate group, compared with no change in blood pressure
readings in the white chocolate group.
Tests suggested that steady exposure to dark chocolate prompted
chemical changes that helped dilate blood vessels and regulate
blood pressure, the researchers said.
Participants were told not to eat other cocoa-containing
products and to continue regular eating habits and activity levels.
They also kept food diaries so researchers could see if other foods
might have influenced the results.
But, said Taubert, "It is very unlikely that other factors may
explain the blood pressure reduction."
Dr. Lawrence Appel of Johns Hopkins School of Medicine said the
most proven non-drug methods for lowering blood pressure are losing
weight and eating less salt. Eating dark chocolate might help if
combined with those two, he said.
For most people, "the lower your blood pressure, the better you
are. So if you can get it lower from different strategies that's
good for the long term," Appel said.
(China Daily via AP July 6, 2007)
