Excerpt:
Boing Boing: Chocolate ingredient fights cancer
Chocolate ingredient fights cancer
Georgetown University scientists report that an ingredient in chocolate seems to have anti-cancer properties. Found in cocoa, pentameric procyandin turns off proteins that likely spur the out-of-control division of cancer cells. The research is funded by Mars Inc., makers of M&Ms and Snickers. Seriously. From the press release:

“There are all kinds of chemicals in the food we eat that potentially have effects on cancer cells, and a natural compound in chocolate may be one,” said the lead author, Robert B. Dickson, Ph.D., professor of oncology. “We need to slowly develop evidence about the selectivity of these compounds to cancer, learn how they work, and sort out any issues of toxicity.”

Chocolate, like many other foods, is the source of many possible anti-cancer compounds, but Dickson stresses that this research, which is part of a series of studies conducted at Georgetown on the chocolate-cancer connection, does not mean that people who eat chocolate will either reduce their cancer risks or treat a current case.