Dark Chocolate Products in the US Contaminated with Lead and Cadmium: Study from George Washington University

A recent study conducted by researchers at George Washington University has revealed that several dark chocolate products in the United States are tainted with lead and cadmium, two toxic metals. The study, which was published in the peer-reviewed journal Frontiers in Nutrition, examined over 70 dark chocolate items available from retailers like Whole Foods Market, Amazon, and GNC. Despite no products exceeding the maximum contamination levels, the study found that 43% of the samples had levels of lead contamination above permitted standards, while 35% contained cadmium within California's allowable limits for heavy metals in food.

Lead and cadmium levels in the chocolate samples ranged from 0.29 to 14.12 micrograms per daily serving, with the maximum permitted level being 4.1 micrograms per day. Leigh Frame, the study's co-lead author, highlighted that while the overall amount of lead found was not cause for alarm, many individuals may be unaware of their exposure to these heavy metals. The lack of established limits by the US Food and Drug Administration (FDA) on heavy metals in most foods leaves consumers with limited guidance on safe consumption levels.

Organic dark chocolate products showed higher levels of contamination, but researchers were unable to pinpoint how the metals entered the chocolate. Frame stressed the importance of not trying to completely avoid heavy metal exposure, but rather ensuring that intake remains within safe limits. This study serves as a reminder for consumers to be mindful of heavy metal exposure in their diets and to stay informed about potential risks associated with their favorite chocolate treats.