Research raises alarm over pesticides tied to birth defects, premature births

A growing body of scientific research has raised concerns about the potential health impacts of neonicotinoids, the world’s most widely used class of insecticides, with studies suggesting that human exposure begins before birth and may be linked to a range of neurological, reproductive and developmental disorders.

Neonicotinoids, commonly used on crops such as corn and soybeans, as well as in household pest control and pet flea treatments, have been detected in food, drinking water, household dust, breast milk, placental tissues and infant cord blood.

A recent review found that more than 95 percent of pregnant women tested had traces of the chemicals or their metabolites in their bodies.

Researchers say the pesticides, which are chemically similar to nicotine, can affect the nervous system by interacting with receptors found in both insects and mammals. Several studies have associated prenatal and early-life exposure with lower cognitive scores, developmental delays, behavioral problems and reduced motor skills in children.

Other research has linked neonicotinoid exposure to reproductive disorders, reduced fertility, hormonal disruptions, birth defects, preterm births, and increased risks of breast and liver cancer. Studies have also suggested possible connections to Type 1 diabetes and other chronic health conditions.

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Environmental experts note that neonicotinoids are highly persistent in soil and water and have been widely blamed for declines in bee populations and other beneficial insects. These concerns have led the European Union to ban or severely restrict several neonicotinoids, while their use remains widespread in the United States and many other countries.

Manufacturers, including Bayer, maintain that neonicotinoids are designed to selectively target insect nervous systems and are safe for humans and other mammals when used according to regulatory guidelines.

Despite those assurances, scientists continue to call for closer scrutiny of the pesticides, arguing that mounting evidence warrants stronger regulations and further investigation into their long-term effects on human health and the environment.