Recent research has revealed that over 485 chemicals found in pesticide products in the United States may be associated with breast cancer. This discovery raises significant concerns about the safety of various foods and products, especially as instances of early-onset breast cancer are on the rise globally.
A peer-reviewed study published in Environmental Health Perspectives, a well-respected journal from the American Chemical Society, sheds light on what public health advocates argue are widespread shortcomings in the regulation of pesticides in the US. The review not only covers active pesticide ingredients but also includes hundreds of so-called “inert” or inactive components that typically escape comprehensive safety evaluations.
Currently, the Environmental Protection Agency (EPA) only analyzes the individual health risks of each pesticide ingredient without considering the entire formulation or potential exposure to multiple pesticides simultaneously. These chemicals aren’t limited to agricultural use. They can also be found in lice treatments for children, lawn fertilizers, and flea and tick products.
“When you combine these exposures, the implications can be quite serious,” said Jenny Kay, a co-author from the Silent Spring Institute. “We aimed to raise awareness about the presence of these pesticides in various products.”
Breast cancer is the second most commonly diagnosed cancer in the US, following skin cancer. According to the American Cancer Society, the incidence of breast cancer has been rising at a rate of 1% each year, with an even steeper increase of 1.4% among women under 50.
Pesticide usage has also escalated recently. Federal health data indicated that 84 of the chemicals associated with breast cancer were found in the general population, but scientists believe this number is an understatement, as many compounds identified by the Silent Spring Institute were not tracked.
The pesticide review forms part of a broader initiative by the institute to uncover where people are exposed to breast cancer-related chemicals in everyday life. They have pinpointed about 500 such chemicals in commonly used products and 462 in drinking water.
Interestingly, only around 145 of the chemicals tied to pesticides are registered with the EPA as active ingredients, suggesting that the chemical industry may be using the inert designation to evade health assessments or exploiting regulatory loopholes.
Inert ingredients are often added to enhance the effectiveness of active components, making them more absorbable or dispersible. With roughly 4,000 inert substances authorized for use by the EPA, including PFAS “forever chemicals,” their addition can sometimes increase toxicity to living organisms.
“The body does not differentiate between inert and active ingredients – inactive substances can pose just as much danger to human health,” Kay emphasized. She highlighted that this misunderstanding poses a significant regulatory blind spot. Earlier in 2023, the EPA dismissed a legal petition aimed at implementing tougher reviews for inert ingredients.
Kay also pointed out another significant issue involving hormone-disrupting chemicals, which can cause diseases at minimal exposure levels, complicating how the EPA assesses risk. This “non-monotonic dose response” has allowed some chemicals’ risks to be overlooked, particularly regarding low exposure levels that may still contribute to cancer.
Top officials in EPA offices related to pesticides and chemical safety are often former industry lobbyists. This situation has led to concerns that the pesticide office, in particular, may be heavily influenced by industry interests.
“While I can’t speak for the thought process of EPA scientists, I genuinely worry about the pressure from the industry and the constant movement of people between regulatory and industry roles—this influences how chemicals are evaluated and regulated,” Kay remarked.
The Silent Spring Institute has suggested expanding California’s Proposition 65, which mandates warnings for chemicals known to cause cancer or reproductive harm. The study found 16 pesticides currently not included in Prop 65, and the authors believe that adding these to the list could deter companies from using them.
For individuals looking to minimize exposure, opting for organic produce and products not treated with pesticides is advisable when feasible. If that’s not an option, Consumer Reports provides a straightforward guide on which fruits and vegetables are likely to have higher pesticide residue levels, including blueberries, watermelon, kale, and green beans.
A recent report indicated that approximately 25% of the nation’s water supply and around 675,000 wells contain dangerous levels of atrazine, a hormone-disrupting chemical linked to breast cancer. While no water-filtration system can completely eliminate pesticides from water, activated carbon and reverse osmosis are generally noted to be the most effective methods.
