In recent years, the presence of microplastics in human environments has become an increasingly concerning topic, extending its reach to the very beginnings of human life. Originally detected in four human placentas, the discovery marked the commencement of a troubling trend. Fast forward to the beginning of 2023, and the narrative deepened with findings of microplastics in 17 placentas. A subsequent study in Hawai'i, analyzing donated placentas from 2006 to 2021, underscored a significant rise in plastic contamination over time.

Now, researchers have analyzed an even larger sample, and guess what? Every. Single. Placenta. contained plastic.

Researchers employed a novel technique to scrutinize the largest collection of placenta samples to date, uncovering minuscule plastic particles and fibers in all 62 tissue samples examined. These microplastics varied in concentration significantly, ranging from 6.5 to 685 micrograms per gram of tissue—a level surpassing those found in human blood. 

The full implications of this contamination for both fetal and maternal health remain unclear. Although studies on mice have identified microplastics in every major organ, including the brain, the permanence and potential health threats of these pollutants in humans are still under investigation.

In other words, the scary part is that we have no idea what this means for babies or mothers. Microplastics are turning up in major organs of animals, even the brain! What if they build up in our bodies over time? It's clear that microplastic pollution is only getting worse, and that means more of it will end up in placentas.

"The more plastic there is, the more worried we should be," says biologist Matthew Campen. He's right – this could affect every mammal on Earth, and that's a truly terrifying thought.

As the prevalence of environmental plastic pollution escalates, so too does the risk of placenta contamination, given the increasing inhalation and ingestion of plastics by humans. The sentiment, "dose makes the poison," shared by biologist Matthew Campen from the University of New Mexico, highlights the growing concern over the potential health impacts as exposure levels rise. This scenario suggests a broader ecological concern, indicating that the effects of plastic pollution could extend across mammalian life on Earth.

Advancing the method of microplastic detection has been a pivotal area of research, aiming to quantify the mass of these pollutants and identify their specific types of plastic. This effort is crucial for assessing their health impacts. A breakthrough technique now allows for a high-resolution examination of plastics in human blood and tissue. It involves separating biological materials from plastic solids and analyzing the polymers to pinpoint their specific compounds.

We still have a lot of unanswered questions. What makes some placentas have way more plastic than others? Can these tiny particles even get from the placenta to the baby? More studies are urgently needed, because one thing's for sure – this pollution problem isn't going away on its own.