Chicago ? 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 today’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.

Dr. Lawrence Appel of Johns Hopkins School of Medicine said the most proven nondrug 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.