HiddenMysteries: Chocolate to treat hypertension

All it takes is a bite of the dark stuff

Small amounts of dark chocolate seem to lower blood pressure, according to a study from Germany that adds mounting evidence linking dark chocolate with health benefits. The new research is the first to suggest that just a tiny amount may suffice.

Volunteers for the study ate just over 6 gm of dark chocolate daily for almost five months — one square from a German chocolate bar called Ritter Sport. People who ate that amount ended up with lower blood pressure readings than those who ate white chocolate.

Small reductions

University of Cologne researcher Dr. Dirk Taubert, the lead author, said the blood pressure reductions with dark chocolate were small but still substantial enough potentially to reduce cardiovascular disease risks, though study volunteers were not 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 are credited with giving red wine its heart-healthy benefits.

One problem is that chocolate bars containing cocoa tend to have lots of calories, so Dr. Taubert and 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 Centre. She stressed that the study results should not be viewed as licence 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.

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 readings in the white chocolate group.

Chemical changes

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 kept food diaries so researchers could see if other foods might have influenced the results.

But, said Dr. Taubert, “It is very unlikely that other factors may explain the blood pressure reduction.”

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Chocolate to treat hypertension

Thursday, July 05 2007 @ 05:51 AM CDT