Is it healthy to eat a small amount of dark chocolate every day? If so, how much?

If your’re going to eat chocolate, dark is better because of its concentration of flavonoids, which might help lower blood pressure and possibly reduce the risk of other diseases. But research is still up in the air as to the extent of those effects and the ideal amount to eat. A study of Swedish women found that eating one to three servings of chocolate a week was associated with a lower risk of heart failure over nine years, but that eating a serving or more a day was not. That could be because even “healthy” chocolate has plenty of fat (8.5 grams per ounce) and calories. So your best bet might be to eat several small servings a week. Look for chocolate with at least 70 percent cocoa solids to maximize the benefits.
Source: Consumer Reports on Health September 2011