Ankh Rah's Healthy Living Guide
Thursday, 3 July 2014
Thank Your Gut Bacteria For Making Chocolate Healthful
Boy, it's a good time to be a dark-chocolate lover.
We've noted before the growing evidence that a daily dose of the bitter bean
may help reduce blood pressure. There also seems to be
a link between a regular chocolate habit and lower body weight.
Now scientists are offering an explanation for just why cocoa powder may be
good for the heart and waistline. The magic may reside
in our microbes.
The friendly bacteria in our guts can gobble up cocoa powder and turn it into
compounds known to help the heart, food scientists
from Louisiana State University reported Tuesday at the American Chemical
Society meeting in Dallas.
The critters also convert the cocoa powder into molecules that reduce
inflammation and help tell us when we're full.
For centuries, people have been attributing a vast array of
to eating chocolate, from curing infertility and fatigue to
fever and dental problems. But so far, the links to lower blood pressure and
heart health have been the strongest — and one of the
few benefits to pass muster in the eyes of science.
"These are good
compounds to have in your gut," says John Finley, who led
the study. "They can get absorbed into your blood" and protect cells in your
blood vessels from stress, he says.
"I was holding out for scientists to prove chocolate's aphrodisiac effect,"
Finley jokes. "But it's the cardiovascular benefits that will
probably pan out. Our findings are one more brick in the road to proving
Of course, Finley is talking about cocoa powder here: The stuff that has
no sugar and milk in it. "Our results don't translate to a
Hershey bar," he says. "But cocoa powder goes well with many foods.
I put it on my oatmeal every morning with berries."
Cocoa powder is packed with potent antioxidants, called polyphenols. These
healthful molecules are also found in dark berries and
black tea. And they're known to help the heart and possibly prevent cancer.
But there's one major problem with many polyphenols: They're so large that
they don't get absorbed into the blood. That's where the
critters in your gut can help out, Finley says.
Previous studies have found that gut bacteria like to feast on polyphenols
from blackberries and tea. So Finley wanted to see what
the bugs would do with the polyphenols in cocoa powder.
"It's a rather yucky way of mimicking people's lower gut," Finely says.
"It's just a mixture of fecal matter. We pay people $20 to
give us a sample. We get a lot of graduate students to volunteer."
his students passed the cocoa powder through a
device that mimics the human gut. First, it treats the cocoa with enzymes
like the ones in your stomach. And then the remaining
material goes through an "artificial colon."
Sounds gross, but those "donations" are teeming with life — trillions of
bacteria that see the cocoa powder as a five-star dinner.
"The microbes break down the polyphenols into smaller molecules that
are more likely to make it across the gut into the blood,"
Finely says. Those compounds are the good ones that help reduce
inflammation and stress in the blood vessels.
And the friendly bacteria don't stop there. They also feasted on the
fiber in cocoa powder, Finley and his team found. "The
microbes break down the fiber into short fatty chain acids, which get
absorbed and can have an effect on satiety," he says.
Of course, Finley and his team have to confirm their results in real
digestive tracts. "The next step is to give people cocoa powder
and see if we can find these metabolites in the blood," he says.
Those types of experiments are critical to figuring out exactly what's
in chocolate that makes it healthy for the heart, says
Joshua Lambert, a food scientist at Pennsylvania State University,
who wasn't involved in the study.
"That's the big missing link right now," Lambert tells The Salt. We know
now that gut bacteria can break down cocoa into compounds
that have beneficial cardiovascular effects, he says. But we don't
know yet if these are the critical ones inside the blood.
In the meantime, I'll keep indulging my gut bacteria with a few cubes
of extra dark chocolate each day. Seems like a win-win
situation for both of us.
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