Concerns over the safety of breast milk have resurfaced with a recent study revealing high levels of hormone-disrupting chemicals in samples from mothers in Seattle, US. The research, led by non-profit organisation Toxic Free Future, raises questions about the potential risks to infant health due to exposure to these substances.
The analysis of 50 breast milk samples found that approximately 92% contained at least one of the five tested compounds: BPA, BPS, melamine, cyanuric acid, and triclosan. These chemicals are commonly used in everyday products such as personal care items, food packaging, and infant formulas. They can interfere with hormonal development in newborns and have been linked to a range of health problems, including impaired neurodevelopment and reproductive issues.
According to the study's co-author, Ryan Babadi, infants and children are particularly vulnerable due to their rapid developmental stages, which are heavily influenced by the endocrine system. Even low levels of these chemicals can be concerning, given their potential to cause harm. The presence of multiple classes of endocrine-disrupting chemicals in breast milk, including melamine for the first time, is a notable finding.
The study found that 74% and 78% of samples contained BPA and BPS, respectively. These plasticisers have been linked to developmental and reproductive harms, with BPA associated with impaired neurodevelopment, asthma, and obesity. Triclosan was detected in 62% of samples, while melamine was present in 92%. The researchers stress that these findings are not unique to breast milk, as many of the same chemicals can also be found in infant formulas.
While breastfeeding remains the healthiest option for infants when possible, the study highlights a 'widespread, systemic problem' caused by the extensive use of these compounds and inadequate regulatory oversight. As the researchers note, consumers cannot simply avoid exposure to these chemicals by choosing different products, as they are ubiquitous in consumer goods.
The World Health Organisation's tolerable daily intake for some of these compounds is exceeded by levels found in this study, although it is acknowledged that more research is needed to fully understand the implications. The findings suggest that greater action is required to address the widespread contamination of breast milk and infant formula with hormone-disrupting chemicals.