While it is true that heavy metals can be found in many different types of dark chocolate, I think it's also interesting to point out that heavy metals can also be found in a wide variety of other foods, not just chocolate. according to the article linked, "heavy metals can be found in many foods—such as arsenic in rice, mercury in some types of fish, cadmium in spinach, and lead in carrots and sweet potatoes." It appears that the most important thing is balance and being aware of what you are putting in your body, as it seems unlikely any of these heavy metal levels will change anytime soon.