Chemical exposure linked to lower IQ in children

A study has found that exposure to certain chemicals during the third trimester of pregnancy may be associated with a small but measurable decrease in children's IQ scores. The research focused on phthalates and phenols, which are commonly found in packaging, cosmetics, and other everyday products.

Study details and methodology

The research involved 380 pregnant women and their infants, with exposure levels to 26 phthalates and phenols measured through repeated urine samples. At age three, the children’s cognitive abilities were evaluated by a neuropsychologist using a standardized test, while other factors like parental education and breastfeeding duration were also recorded.

Priority chemicals and findings

Researchers focused on chemicals previously identified as harmful, including two bisphenols (A and S) and specific phthalates. The study found that higher exposure levels to a mixture of these substances were linked to a 2.86-point decrease in IQ scores. Individual exposure to four of these substances also correlated with lower IQ scores.

Population-level impact

While a small drop in IQ for an individual child might seem minor, the study highlights that across a population, this could result in more children facing challenges and fewer excelling academically. This has potential implications for education, health, and the economy, especially considering many neurotoxic substances may still be unexamined.

Prevention and regulation

The substances studied do not remain in the body for long, making them good targets for prevention. Reducing exposure through personal choices, such as using fewer cosmetics or limiting packaged foods, can help. However, the most effective measure is regulation and restriction of harmful substances to benefit the entire population.