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The mixture contained dioxin, a deadly substance that not only causes a range of cancers and other illnesses, but is also linked to birth defects for babies exposed in utero.

"Of course, subsequent environmental exposures are key, just as in utero environment is important. Fortunately, the brain is exceptionally adaptable, and we want to understand the cognitive, behavioral, and sex-dependent factors associated with both risk and resilience in order to intervene early and maintain intact memory function as we age."

Previous studies have found an increased risk of Type 2 diabetes and obesity later in life for infants exposed to GDM in utero.

The study followed 198 infants, half of whom were exposed to GDM in utero.

Animals previously exposed to THC in utero display a dramatically increased motivation to press a lever that would deliver a dose of opioid drugs compared to those that were not previously exposed to THC.