Be careful the next time you crave that dark chocolate bar. The organization, Consumer Reports, says two dangerous heavy metals, lead and cadmium, showed up in tests of 28 dark chocolate bars, including bars of some popular brands.

According to Consumer Reports, for 23 of the bars, eating just an ounce a day could put an adult over acceptable levels for at least one of those metals. Five of the bars were above those levels for both cadmium and lead.

The two heavy metals linked to a host of health problems in children and adults. The danger is greatest for pregnant people and young children because the metals can cause developmental problems and affect brain development, said Tunde Akinleye, the Consumer Reports food safety researcher who led the project. They say consistent, long-term exposure to even small amounts of heavy metals can lead to a variety of health problems. (READ MORE)