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Prescription Strength Chocolate, Revisited
Science News ^ | Feb. 25, 2006 | Janet Raloff

Posted on 02/25/2006 11:46:48 AM PST by nickcarraway

For roughly a decade, science-savvy chocolate consumers have taken comfort from a string of studies suggesting that their sweet and usually high-fat vice has a potential up side. The most reassuring news was that the antioxidant flavonoids abundant in dark chocolate appear to reduce blood pressure and perhaps protect people from dangerous blood clots. At the Cocoa Symposium, convened at the National Academy of Sciences in Washington, D.C., earlier this month, researchers reported new findings on chocolate's biological impacts. The studies focus on specific flavonoids in chocolate, such as epicatechin, that offer the strongest cardiovascular benefits. The bad news: Most commercial products—even dark chocolates—retain few if any of these natural, plant-based chemicals.

However, the new data do suggest how chocolatiers might tailor their candy recipes to preserve—and potentially even augment—concentrations of beneficial flavonoids. The new studies also might provide some reasons that diets rich in fruits and vegetables are good for people's hearts.

"Cocoa is a fruit," notes chemist Harold H. Schmitz, chief science officer for Mars Inc., the world's largest chocolate manufacturer. Those flavonoids in cocoa that appear to confer the strongest cardiovascular benefits are found in plenty of other dietary sources as well, including tea and apples. Indeed, he says, any of these plant products might yield bioactive compounds that could fight heart disease.

Debunking cocoa myths At the Cocoa Symposium, researchers presented data to shatter a pair of longstanding "myths," Schmitz observes. The first is that the heart-healthy components of cocoa are antioxidants that quash naturally destructive molecular fragments in the body. The second misperception is that a person can get cocoa's heart-protecting constituents simply by downing nearly any off-the-shelf dark chocolate.

Early work by scientists at Mars and elsewhere fostered both perceptions, Schmitz admits. For instance, studies had traced at least some cardiovascular benefits to a class of flavonoids known as flavanols and their polymers called procyanidins (SN: 3/18/00, p. 188). Key among the chocolate flavanols linked to heart benefits was epicatechin, a known antioxidant. Dark chocolates—including those that are the main ingredients in Mars' Dove Dark bar and the mini M&M baking bits—were identified as being rich in these constituents.

However, University of California researchers Hagen Schroeter and Christian Heiss presented data at the symposium indicating that at least some of the flavanols' benefits trace to functions other than fighting oxidation. For instance, standard commercially processed cocoa powder has little or no flavanol content, but it retains a high concentration of other antioxidants. This cocoa offered almost no cardiovascular benefits in tests with isolated tissues or people consuming the cocoa.

Moreover, notes Schroeter, even in people consuming flavanol-rich cocoa products, "most of the flavanols present in [blood] have been altered by the body following consumption and are known to have even less antioxidant potential than their parent [compounds]."

Schroeter's group teamed up with Norman K. Hollenberg, Schmitz, and others to look at how cocoa's epicatechin works. At the meeting, Hollenberg described finding that this flavanol and its breakdown products enhance production of nitric oxide (NO). In the body, NO dilates blood vessels, relaxes arteries, and enhances blood flow.

In one trial, the researchers administered cocoa drinks to 10 people and monitored the effects on blood flow. On one occasion, each person got a cocoa drink that was virtually devoid of flavanols. Another time, each volunteer drank a cocoa that tasted the same but was rich in these flavanols. Neither the participants nor the people taking the blood-flow readings knew which cocoa had been administered.

Only the flavanol-rich drink produced substantial blood-flow benefits, the researchers report in the Jan. 24 Proceedings of the National Academy of Sciences (PNAS). The fact that the benefits, which lasted several hours, were prevented by administering a drug that shuts down NO production "unambiguously showed that cocoa flavanols turned on NO synthesis and improved blood flow," Schmitz says.

He adds that the study exposes the fallacy of judging chocolate's flavanol content by measuring its cocoa-solids content. Both drinks administered in this trial were prepared with the same share of cocoa solids, Schmitz points out.

Lessons from the Kuna In the PNAS paper and at the Cocoa Symposium, Hollenberg reviewed data he's gleaned from studying two genetically similar populations of Kuna Indians, people renowned for their cocoa consumption. One group of the Kuna lives on the San Blas islands off Panama. The other consists of migrants residing on the mainland in Panama City.

In earlier work, Hollenberg reported that the island-dwelling Kuna had significantly lower blood pressure than their mainland kin did (SN: 3/2/02, p. 142: Available to subscribers at http://www.sciencenews.org/articles/20020302/note17.asp). One difference between the populations: The islanders drank an average of 5 cups of cocoa daily, but the mainland group downed fewer than 4 cups per week.

Schmitz notes that the two populations also drank different cocoas. Traditionally, island-dwelling Kuna take fresh-picked cocoa beans and dry them under the sun. Then, they grind the beans into a powder for use in foods and drinks. "Effectively," he says, "they're consuming about as close to fresh cocoa as one can get." By contrast, the islanders' mainland kin now tend to drink commercial cocoas that have been as heavily processed as U.S. cocoas. The products also retain as little of the starting flavanols as most U.S. products do.

Hollenberg's follow-up work, reported in the PNAS paper, confirms that the islanders also have far larger exposures to cocoa flavanols. Tests showed that flavanol-residue concentrations in urine were six times as high in the islanders as in the mainlanders.

At the Cocoa Symposium, Hollenberg reported that dramatic long-term benefits may be attributable to the islanders' cocoa habit: Their death rate from heart disease is less than 8 percent of that in Kuna mainlanders, and cancer kills only 16 percent as many islanders. The two populations were matched for age, weight, and a number of other factors that might affect heart and cancer risks.

Hollenberg concludes that the Kuna epidemiological data, although preliminary, "indicate that a flavanol-rich diet may provide an extraordinary benefit in the reduction of the two deadliest diseases in today's world."

Toward healthier chocolates . . . and spin-offs Schmitz acknowledges that "Mars, like every other chocolate business, tends to use cocoa that has been processed in the standard industry way." The result is that most of its products end up virtually devoid of flavanols.

Like its competitors, Mars doesn't want to tinker greatly with the recipes of its popular products. However, for much of the past decade, the company has been seeking to create a snack that would not only taste good—which pure cocoa does not—but also would pack a healthy wallop of epicatechin and related compounds. The company has recently begun marketing a relatively low-calorie, high-flavanol candy bar using a specially processed starting ingredient called CocoaPro.

In the August 2005 Journal of Hypertension, Hollenberg and Naomi D.L. Fisher of Brigham and Women's Hospital describe the flavanol content of various chocolate products. CocoaPro powder topped the list, with nearly 5,000 milligrams of flavanols per 100 grams of cocoa. The Kuna islander's cocoa beans contained nearly 4,000 mg/100 g, and their cocoa powder had 2,000 mg/100 g. "In stark contrast," the researchers observe, "all of the commercially available cocoa powders or chocolate drinks that can be purchased in American supermarkets have flavonoid contents substantially less than 5 percent of [CocoaPro's]."

Not so fast, argue Jonathan M. Hodgson and Ian B. Puddey of the University of Western Australia School of Medicine and Pharmacology. In an editorial appearing in the same Journal of Hypertension issue, they agree with Hollenberg and Fisher that a growing body of work supports the idea that diets rich in flavonoids benefit the heart. However, the Australian team adds, "The method still widely used to quantify flavonoids is crude and provides no information about the [specific] type of flavonoids present." Moreover, they note, not all flavonoids are readily absorbed by the body. Finally, they point out that no study has yet evaluated whether increasing flavonoids in study volunteers' diets—from chocolate, tea, wine, or any other products—will cut that population's heart-disease incidence.

Schmitz agrees that there's still a lot to learn. Although his team's new PNAS paper fills in some of the gaps that Hodgson and Puddey referred to, Schmitz says that large, multiyear trials of people eating flavanol-rich products are needed. However, such studies are beyond the financial reach of a candy company, he says. He's hoping the new data are suggestive enough to entice the National Institutes of Health or another funding organization to step in and back such clinical follow-ups.

In the meantime, while studying how to synthesize flavanols, Mars has developed a few novel compounds that might prove even more potent than epicatechin at triggering NO synthesis. Although these compounds "have zero application for us [as candy makers], they might have use in pharmaceuticals," Schmitz told Science News Online. Indeed, he says, "if the benefits prove striking enough, we might some day license the compounds" to companies developing cardiovascular drugs.

For Carl Keen of the University of California, Davis, who has conducted some chocolate studies, there is a somewhat different spin-off. Data on the biological action of flavanols reported at the Cocoa Symposium "add new and important pieces of information that will help us understand why diets rich in fruit and vegetables promote cardiovascular health," he says. Chocolate science is pointing to which agents in apples, grapes, and other produce might offer the most benefits—and why.


TOPICS: Business/Economy; Constitution/Conservatism; Culture/Society; Miscellaneous; News/Current Events; US: District of Columbia
KEYWORDS: chocolate; wodlist
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Raw cocoa beans, shown here nestled in their pods, contain huge amounts of heart-healthy flavanols. Commercially processing the beans to make cocoa powder strips away most of those compounds. Mars, however, determined how to retain them to make flavanol-rich cocoa for research trials—and for what it's now marketing as a heart-healthy snack.

1 posted on 02/25/2006 11:46:50 AM PST by nickcarraway
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To: nickcarraway
I need endless refills.
2 posted on 02/25/2006 11:51:07 AM PST by satchmodog9 (Most people stand on the tracks and never even hear the train coming)
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To: nickcarraway

I hope all this means that I'm encouraged to eat more chocolate.


3 posted on 02/25/2006 12:01:52 PM PST by FoxInSocks
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To: FoxInSocks
You can eat all of the chocolate that you want. Dark chocolate is a comfort food and therefore makes your mind and body work much better to keep illness's away.
4 posted on 02/25/2006 12:12:02 PM PST by Coldwater Creek ("Over there, over there, We won't be back 'til it's over Over there.")
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To: nickcarraway

Oh great! That's all I need, a medical reason to eat more chocolate. And this with Lent around the corner ... talk about good timing!


5 posted on 02/25/2006 12:34:54 PM PST by NearlyNormal (Our military wins wars, the liberals and their MSM lose them.)
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To: FoxInSocks
I hope all this means that I'm encouraged to eat more chocolate.

Ditto.

6 posted on 02/25/2006 1:18:59 PM PST by ContraryMary (New Jersey -- Superfund cleanup capital of the U.S.A.)
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To: Honeybunch

Ping.


7 posted on 02/25/2006 1:22:29 PM PST by OKSooner
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To: FoxInSocks

Let all the world's Easter Bunnys/eggs tremble at thy ominous presence, Thy Great Flavanol-ness.


8 posted on 02/25/2006 1:48:29 PM PST by ExcursionGuy84 ("Jesus, Your Love takes my breath away.")
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To: nickcarraway
Hughes Homaid Chocolate Shop, 1823 Doty St, Oshkosh, WI. (920)231-7232

Click on link for ordering from their only online distributor

I used to live a couple of blocks from this place...they still make home made chocolates in their basement-candy store...

9 posted on 02/25/2006 1:50:37 PM PST by joesnuffy (A camel once bit our sister..but we knew just what to do...we gathered rocks and squashed her!)
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To: satchmodog9
Let's permit liberals to take on the oil crisis and conservatives to take on reducing health care costs. Liberals can stop their addiction to oil and conservatives will eat more chocolate.
10 posted on 02/25/2006 1:54:09 PM PST by Galveston Grl (Getting angry and abandoning power to the Democrats is not a choice.)
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To: NearlyNormal

Saw my 13 year old granddaughter in a t-shirt this week that said,"Hand over the chocolate and nobody gets hurt".
She is so cute.


11 posted on 02/25/2006 2:01:41 PM PST by phil1750 (Love like you've never been hurt;Dance like nobody's watching;PRAY like it's your last prayer)
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To: phil1750
"Hand over the chocolate and nobody gets hurt"

That'd be a perfect gift for my wife for next Valentine's day! Come to think of it, it'd be perfect for her just about any day.

12 posted on 02/25/2006 2:11:35 PM PST by NearlyNormal (Our military wins wars, the liberals and their MSM lose them.)
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To: nickcarraway
Bad news....a healthy wallop of epicatechin and related compounds

It seems epicatechin compounds are even more concentrated in..

Green Tea...

13 posted on 02/25/2006 2:13:08 PM PST by joesnuffy (A camel once bit our sister..but we knew just what to do...we gathered rocks and squashed her!)
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To: nickcarraway

This is an example of the articles which try to kill happy experiences. Eating chocolate, full of flavonoids or not, is one of my happier moments in any day. Thank God, I am free to decide for myself if the the risk(?) will be heeded or put out of my mind. I choose to put it out of my mind and enjoy to my "hearts" content.


14 posted on 02/25/2006 2:13:47 PM PST by Frwy
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To: Frwy; All
Somewhere there is a FReeper who has on their "About" page or within their tagline the phrase:

"Save the Earth. It's the only planet with Chocolate."

If anyone remembers who that is (and I'm sorry, I don't recall right at the moment, I must have a hairball...)

...please, Please, PLEASE Ping them to this thread :-)

This has been a public service announcement brought to you by the Almagamated Chocoholics' Union, Local 122. Thank you!

15 posted on 02/25/2006 3:10:56 PM PST by grey_whiskers (The opinions are solely those of the author and are subject to change without notice.)
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To: Frwy
Almost forgot, in my last post.

Full Disclosure:

Cheers!

16 posted on 02/25/2006 3:12:01 PM PST by grey_whiskers (The opinions are solely those of the author and are subject to change without notice.)
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To: nickcarraway

Makes you want to tear open a Hershey bar with your teeth, doesn't it?

17 posted on 02/25/2006 3:13:56 PM PST by Liz (Liberty consists in having the power to do that which is permitted by the law. Cicero)
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To: nickcarraway

Time to edit the food pyramid. I'm thinking a single brown circle this time.


18 posted on 02/25/2006 3:15:28 PM PST by King Moonracer
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To: nickcarraway
Prescription Strength Chocolate, Revisited

...goes a long way toward explaining Ray Nagin's public utterances post-Katrina.

(I can't tell you how shocked I am that I'm the first one in the last three hours or so to make that connection.

19 posted on 02/25/2006 3:15:37 PM PST by RichInOC (New Orleans has survived just about every disaster thrown at it, except possibly bad government.)
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To: nickcarraway

I think that our government should regulate this potentially dangerous substance.


20 posted on 02/25/2006 3:18:17 PM PST by opinionator
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