Project Unleaded
20x20 | Combating lead contamination in a common spice
Stanford researchers are addressing a critical food safety issue: lead contamination in turmeric. This widely used spice in South Asian cuisine has been found to contain dangerous levels of lead, posing significant health risks to millions of consumers.
The global spice trade is a multibillion-dollar industry, with turmeric being a key component. However, the desire for vibrant yellow color has led to a dangerous practice: the addition of lead chromate to enhance turmeric's appearance. This contamination has far-reaching consequences for public health, particularly in South Asia where turmeric is a dietary staple.
The interdisciplinary team, bringing together experts in medicine, food and Earth sciences, has made groundbreaking discoveries. Their research, initially funded by a 2013 Woods Environmental Venture Projects (EVP) grant, identified lead adulteration in turmeric as the primary cause of elevated blood lead levels across rural Bangladesh.
The team's collaboration with government authorities has resulted in interventions that have decreased lead levels in turmeric by more than 90% within a few months and 100% within two years. The research has led to the implementation of stricter testing and quality control measures in the spice industry, enhancing food safety protocols. Public health initiatives and education campaigns informed by the project have targeted interventions to reduce lead exposure in affected populations and inform people about the risks of lead contamination in spices.
The project's geographical scope has expanded to India and Pakistan, where similar contamination issues have been identified, and its focus has expanded to investigate and address pollution from the lead-acid battery industry.
Now called Project Unleaded, the initiative seeks to identify and prioritize the most important sources of lead poisoning globally via source attribution studies, investigate health impacts, advance rapid lead detection techniques, and develop, test, and scale up interventions to eliminate major sources of lead contamination. Project Unleaded is a foundational project of the growing Stanford Human and Planetary Health Initiative, which supports Stanford research aimed at driving policy- and business-changing breakthroughs at the nexus of human health and the environment, and preparing the next generation of leaders to accelerate this critical work.
Photo Credits: Top (iStock)
We're flashing back! See more stories about high impact research and solutions emerging from our work over the past two decades.
Read the 20x20 series