Consumer Reports suggests that dark chocolate shouldn't be eaten on a long-term basis:
Published December 15, 2022·Updated October 25, 2023
"But there’s a dark side to this “healthier” chocolate. Research has found that some dark chocolate bars contain cadmium and lead—two heavy metals linked to a host of health problems in children and adults.
The chocolate industry has been grappling with ways to lower those levels. To see how much of a risk these favorite treats pose, Consumer Reports scientists recently measured the amount of heavy metals in 28 dark chocolate bars. They detected cadmium and lead in all of them.
CR tested a mix of brands, including smaller ones, such as Alter Eco and Mast, and more familiar ones, like Dove and Ghirardelli.
For 23 of the bars, eating just an ounce a day would put an adult over a level that public health authorities and CR’s experts say may be harmful for at least one of those heavy metals. Five of the bars were above those levels for both cadmium and lead.
Consistent, long-term exposure to even small amounts of heavy metals can lead to a variety of health problems.
Even if you aren’t a frequent consumer of chocolate, lead and cadmium can still be a concern. It can be found in many other foods—such as sweet potatoes, spinach, and carrots—and small amounts from multiple sources can add up to dangerous levels. That’s why it’s important to limit exposure when you can.
Calculating the exact amount of dark chocolate that’s risky to eat is complicated. That’s because heavy metal levels can vary, people have different risk levels, and chocolate is just one potential source of heavy metal exposure. But experts say that by being mindful of the risks, you can still enjoy dark chocolate while minimizing the potential harms."
Edited by Advocatus Diaboli, 08 June 2025 - 08:54 PM.