Chemicals linked to breast cancer found in US food, water, and pesticides

A new analysis published in Environmental Health Perspectives has mapped the presence of 920 chemicals, identified as breast cancer-relevant (BC-Chems), across various everyday sources in the United States. Researchers from the Silent Spring Institute and the University of California utilized federal databases from the Environmental Protection Agency and the Food and Drug Administration to track these substances.

The study found that exposure to these chemicals is widespread and not limited to a single category. The researchers identified 500 BC-Chems likely present in consumer products, 462 in dietary sources, 162 in drinking water, 485 in pesticide formulations, 142 in pharmaceuticals, and 106 in construction materials.

Notably, the research highlighted that in pesticide formulations, 485 chemicals of concern were identified, though only 145 are registered with the EPA as active ingredients. The remaining chemicals are often used as inert ingredients to improve product stability or effectiveness. The authors noted that while the study does not prove these chemicals cause breast cancer in humans, they demonstrate biological activity—such as affecting estrogen or progesterone pathways—that warrants further investigation.