What is it?
BPA is an industrial chemical used since the 1960s to make hard polycarbonate plastics and epoxy resins that line food and drink cans. After decades of public and regulatory pressure, many manufacturers switched to BPA-free alternatives, most commonly BPS. The problem: BPS appears to be equally disruptive to hormonal systems, and possibly more persistent in the environment. The replacement was a substitution, not a solution.
What it does to your body
Oestrogen mimicry
BPA binds to oestrogen receptors and activates them at very low doses, disrupting the hormonal signalling of the entire endocrine system.
Fertility impacts
Linked to reduced sperm count and quality in men, and polycystic ovarian syndrome (PCOS) and egg quality issues in women.
Foetal development
Prenatal BPA exposure is associated with behavioural changes, altered brain development and increased anxiety in offspring.
Breast and prostate cancer
Epidemiological studies link BPA exposure to increased risk of hormone-sensitive cancers.
Metabolic disruption
BPA alters insulin sensitivity and pancreatic function, with links to type 2 diabetes and obesity.
Cardiovascular effects
Higher urinary BPA is associated with increased rates of heart disease and hypertension in population studies.
How widespread is the problem?
CDC biomonitoring has found BPA in over 90% of urine samples from Americans aged 6 and older. Children typically show higher levels than adults relative to body weight. EU studies show similar ubiquity. Despite a nominal phase-out in baby products, BPA and its replacements remain pervasive in the food supply chain.
Where it hides in your home
Key research
NIH National Toxicology Program BPA Assessment
Concluded BPA is a hazard to the mammary gland, brain and behaviour in rodent studies at environmentally relevant doses.
CLARITY-BPA Core Study
FDA-funded study found BPA caused dose-dependent effects on mammary glands and uterus even at very low doses, contradicting earlier FDA positions.
EFSA Re-evaluation of BPA
EFSA dramatically lowered the tolerable daily intake for BPA by a factor of 20,000, reflecting new understanding of immune and metabolic harm.
BPA clears relatively quickly. Urine levels fall significantly within 24 hours of stopping exposure. However, most people are re-exposed constantly through food packaging and cans, so blood levels remain chronically elevated. Eliminating packaging sources is the key lever.