A recent study conducted by George Washington University has raised alarm over the safety of cocoa products in the United States. According to the study, many popular cocoa-based foods contain dangerous levels of toxic heavy metals, such as lead and cadmium.
Extensive analysis of cocoa products
Over an eight-year period, researchers meticulously analyzed 72 cocoa-based foods, including dark chocolate, which is often lauded for its heart-health benefits. The results were startling: 43% of these products contained lead levels exceeding recommended limits, and 35% surpassed cadmium limits.
Organic products are not safer
In a surprising twist, the study revealed that organic-labeled products had higher levels of lead and cadmium compared to their non-organic counterparts. The contamination can originate from soil or occur during the manufacturing process. Leigh Frame, the study’s lead researcher, emphasized, “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.”
Health risks of heavy metal exposure
Frame, who serves as the director of integrative medicine and associate professor of clinical research and leadership at the GW School of Medicine & Health Sciences, cautioned, “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.”
Symptoms of lead poisoning
Lead exposure can cause high blood pressure, and damage to the brain, kidneys, and reproductive system. Symptoms of lead poisoning include headaches, stomach cramps, constipation, muscle/joint pain, trouble sleeping, fatigue, irritability, and loss of sex drive. Cadmium toxicity is also dangerous, potentially causing chills, fever, and muscle pain, with chronic exposure leading to kidney, bone, and lung disease. Seaweeds, particularly hijiki used in seaweed salad, are of special concern for cadmium contamination.
Comparison with previous studies
Frame’s report, published in Frontiers in Nutrition, aligns with a 2022 analysis by Consumer Reports, which detected cadmium and lead in 28 dark chocolate bars.
In 23 of these bars, consuming just an ounce per day would exceed acceptable limits for at least one of these heavy metals. However, contrasting findings were reported in a June study by Tulane University. This study analyzed 155 dark and milk chocolates and found that only one brand of dark chocolate exceeded international cadmium limits, and only four dark chocolate bars had cadmium levels that could pose a risk to toddlers.
Tewodros Godebo, the lead author of the Tulane study, stated, “For adults, there is no adverse health risk from eating dark chocolate, and although there is a slight risk for children in four of the 155 chocolate bars sampled, it is not common to see a 3-year-old regularly consume more than two bars of chocolate per week.”
These findings underscore the importance of being mindful of heavy metal exposure in our diets. While chocolate lovers need not completely avoid their favourite treat, moderation, and awareness are crucial for maintaining good health.
