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Dark chocolate and cocoa products are contaminated with lead and cadmium, two neurotoxic metals are linked to cancer, chronic disease, or reproductive and developmental issues, in children, a new found.

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As natural elements in the Earth¡¯s crust, lead, cadmium and other heavy metals are in the soil in which crops are and thus can¡¯t be avoided. Some crop fields and regions, however, more toxic levels than others, partly to the overuse of metal-containing fertilizers and ongoing industrial pollution.

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However, growing on land with fewer pesticides and other contaminants, organic versions of dark chocolate had some of the highest levels, to the study published Wednesday in the journal Frontiers in Nutrition.

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Dark chocolate is known for being rich in plant nutrients called flavonoids, antioxidants and minerals and has been linked to improved cardiovascular health, cognitive and less chronic inflammation.

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The team examined only pure dark chocolate products as they contain the highest of cacao, the raw, unprocessed part of the cacao bean. Candies or baking chocolates with other ingredients were eliminated. The study did not disclose the names or manufacturers of the tested products.

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The new study analyzed 72 consumer cocoa products for levels of lead, cadmium and arsenic. Compared with prior studies, which have looked at heavy metals in chocolate during a snapshot of time, the latest study tested the products over an eight-year period, in 2014, 2016, 2018 and 2020.

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Of the six dozen chocolate products tested over the course of the study, 43% exceeded the maximum allowable dose for lead as established by California¡¯s Proposition 65, while 35% exceeded the Prop 65 maximum allowable level for cadmium, researchers found. The study found no levels of arsenic.

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Over time, consuming low levels of cadmium can the kidneys. The Environmental calls the metal a human carcinogen.

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There is no safe level of lead, especially for children, according to the World Health Organization.

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“In particular, lead can children¡¯s brain development, resulting in reduced quotient (IQ), behavioural changes such as reduced span and increased antisocial behaviour, and reduced educational attainment,¡± WHO states on its website.

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However, for healthy adults, risk analysis found little to worry about choosing to indulge in 1 ounce of dark chocolate now and again.

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heavy metals ÖؽðÊô ; ÖؽðÊôÒ¡¹öÀÖ ; heavy metalµÄ¸´Êý

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fertilizers ·ÊÁÏ ; fertilizerµÄ¸´Êý

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