Microplastics and Coastal Health Risks

Living near the coast in the U.S. might pose serious health risks, potentially increasing the chances of early death from diabetes, heart disease, or stroke for millions.

A recent study from the American Heart Association raised alarms about microplastics—tiny particles found in nearly every corner of the planet—contributing to significant health issues for those residing near oceans.

The findings showed that in heavily polluted coastal areas, there’s an 18 percent higher incidence of Type 2 diabetes, a seven percent increase in coronary artery disease, and a nine percent rise in stroke cases compared to areas with lower pollution levels.

Interestingly, coastal regions along the Gulf and East Coasts showed higher disease rates than those along the West Coast, specifically noting areas in California, Oregon, and Washington.

Dr. Sarju Ganatra from Lahey Hospital & Medical Center in Massachusetts remarked that this issue extends beyond environmental concerns and touches on public health.

Microplastics refer to plastic particles smaller than five millimeters—about the size of a pencil eraser. These tiny bits originate from degrading plastic waste, including items like bottles, synthetic clothing, and various consumer products.

There’s a growing belief among scientists that microplastics from polluted oceans can end up in drinking water, seafood, and even the air we breathe. When ingested, these particles could contribute to inflammatory responses and other health issues.

According to the National Oceanic and Atmospheric Administration (NOAA), there are over 250 coastal counties in the U.S., home to over 94 million people. Ganatra and his team analyzed data from 152 coastal counties along the Pacific, Atlantic, and Gulf of America from 2015 to 2020, measuring microplastic levels within 200 nautical miles of these areas.

The researchers categorized these counties based on microplastic pollution levels: low, medium, high, and very high. They discovered that even in healthcare settings—typically focused on healing—much reliance is placed on single-use plastics, which often end up polluting the environment.

Using health data from the Centers for Disease Control and Prevention (CDC), they looked into the rates of Type 2 diabetes, coronary artery disease, and stroke within these counties while adjusting for factors like age, gender, and socioeconomic status to ensure clear results.

The results were quite striking: counties with very high microplastic pollution displayed significantly increased rates of health issues associated with early mortality. A relevant study noted that a diagnosis of Type 2 diabetes could reduce life expectancy by over ten years for those diagnosed in their thirties.

Moreover, the World Health Organization suggested that stroke survivors often face a life expectancy that is five to ten years less than those who’ve never had a stroke. Additionally, research from Europe pointed out that coronary artery disease can lead to a notable decrease in life expectancy.

However, this study does have its limitations. It analyzed data at the county level rather than individual cases, so it doesn’t definitively prove that microplastics directly cause these health issues. There was also no direct assessment of microplastics within people’s bodies or a detailed investigation into how they enter, be it through water, food, or air. Furthermore, the study concentrated on ocean pollution, not accounting for contamination from fish or sea plants.

Despite these limitations, Ganatra emphasized that the study highlights a concerning link between the ongoing plastic crisis and rising health problems. He mentioned that “this study adds to a growing body of evidence that the garbage we discard into the environment often finds its way back to us.”

Past research has also associated microplastic contamination in humans with various health conditions, including dementia, infertility, and obesity. Furthermore, studies in mice have suggested a link between nanoplastics in the brain and cognitive changes, even leading to Parkinson’s disease and different types of dementia.