Heavy Metals, Including Lead, Found in Many Dark Chocolate Products

A new study from George Washington University reveals that heavy metals, including lead, have been found in many dark chocolate products.

George Washington University researchers analyzed 72 consumer cocoa products, including dark chocolate. Data was taken every other year over eight years from the samples to determine possible contamination with lead, cadmium, and arsenic. Ultimately, these heavy metals were found in the sweet treat touted as being better for you than milk chocolate.

“We all love chocolate but it’s important to indulge with moderation as with other foods that contain heavy metals including large fish like tuna and unwashed brown rice,” said Leigh Frame, director of integrative medicine and associate professor of clinical research and leadership at the GW School of Medicine and Health Sciences. “While it’s not practical to avoid heavy metals in your food entirely, you must be cautious of what you are eating and how much.”

Study finds heavy metals in many dark chocolate products in the US https://t.co/5dExy7L7KJ

— Guardian news (@guardiannews) July 31, 2024

Some of the key findings include the following data:

• 43% of the examined products surpassed the maximum permissible dose level for lead.
• 35% of the products analyzed went beyond the allowable dose level for cadmium.
• No products exceeded the maximum allowable dose level for arsenic.
• Organic-labeled items unexpectedly contained higher concentrations of both lead and cadmium than their non-organic counterparts.

The study concludes that there are no significant health risks for those who enjoy an occasional piece of dark chocolate. However, those who have “multiple servings” or pair the chocolate with other foods that contain heavy metals could risk ingesting more than the recommended daily dose.

According to NYC Health, significant exposure to lead may cause high blood pressure and brain, kidney, and reproductive health problems. In December 2022, Consumer Reports measured the amount of heavy metals in 28 dark chocolate bars. Cadmium and lead were found in all of them. Dark chocolate tends to be higher in heavy metals than milk chocolate because of its higher cacao content.

Previous research has found that cadmium comes primarily from the cacao plants taking it up from the soil. Lead can be introduced at various points in the manufacturing process, including the harvesting, drying, and fermenting of the cocoa beans.