Xocai dark chocolate, sold only through distributors, is advertised as "the healthy chocolate" with antioxidant-rich acai berries and blueberries. Even so, chocolate has taken a couple of health hits of late. One study linked regular eating of any chocolate to slightly weaker bones because it contains oxalate, making calcium harder to absorb. Another said consumers are misled because some manufacturers often remove heart-healthy flavonols due to their bitter taste and darken the cocoa anyway.

So can dark chocolate be called a health food? "I think that's stretching the point," said registered dietitian Lucinda Miller, St. Vincent Heart Center. "Chocolate has to have fat or sugar in it, or people wouldn't eat it."