A stony beach floor is covered with countless pieces of plastic plastic. Many small shards of broken plastic and small pieces of string can be seen. At the center is a small white plastic figure of a cherub, its hand held up as if in despair.

From the Deep Sea to Your Brain-Where Microplastics Hide Will Shock You

ByHayley Frend

Photo by Sébastistien Vincon

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Microplastics may be tiny, but they pose a huge risk to the environment and our health. They have been big news recently as scientists have been finding them in increasingly unexpected locations. 

From the deepest trenches of the ocean to the peaks of Mount Everest, even inside our own bodies, microplastics are everywhere.

They are almost impossible to avoid. This article will cover some of the unbelievable places microplastics have been found.  

Tiny pieces of plastic lay on a beach, tangled within a small net. The beach is otherwise beautiful, highlighting the damage microplastic pollution does.

Photo by Soren Funk on Unsplash

But First, What Exactly Are Microplastics?

As the name suggests, microplastics are tiny pieces of plastic. They are less than 5mm in diameter, about the size of a sesame seed. 

Primary Microplastics:

  • Intentionally manufactured small plastics
  • Found in cosmetics, toothpaste, industrial abrasives, and microbeads

Secondary Microplastics:

  • Result from the breakdown of larger plastic products due to UV radiation, wind, and water
  • Found in plastic bottles, bags, paint chips and synthetic textiles

Why Are Microplastics a Problem?

Microplastics are a growing environmental threat because they don’t biodegrade. Instead, they linger in nature for decades, accumulating in ecosystems and causing widespread harm. Their tiny size makes them easy for animals to mistake for food. Once inside an animal’s body, these plastics build up and travel up the food chain as predators consume contaminated prey. Over time, this can disrupt entire ecosystems.

Look at how microplastics are affecting Belle, a baby sea turtle.

The impact on wildlife is alarming. Studies suggest that microplastics may slow animal development, interfere with reproduction, and weaken immune systems, making it harder for animals to fight off disease. Another major concern is that these plastics leach harmful chemicals into water sources, affecting not only aquatic life but also animals that drink from contaminated water.

Humans are, unfortunately, not exempt from the spread of microplastics. The average person is estimated to eat drink or inhale between 78,000 and 210,000 microplastic particles every year. While we don’t yet fully understand the long-term consequences, early research links microplastics to serious health risks, including heart disease and strokes.

The issue has become so urgent that the World Economic Forum ranked microplastics as one of the top global threats in its Global Risks Report 2025. Scientists warn that we are in the middle of a global plastic crisis, one that demands immediate action before its effects become irreversible.

If microplastics are everywhere how did they get there? 

How did we allow these tiny invaders into every corner of our planet? The truth is that our everyday actions, from washing clothes to driving cars, are unknowingly sending these dangerous particles into the very systems that sustain life

  1. A big source of microplastics comes from washing synthetic materials. After they are washed the waste water gets taken to a waste treatment plant. Unfortunately, the microparticles are too small to be caught by the treatment plant filters. This means they get released with the treated water and eventually often find their way into the ocean. Here they not only affect the ocean wildlife but get carried to their farthest reaches of our world. 
  2. Another big contributor of microplastics in the ocean is vehicle tyres. In fact, according to the IUCN (International Union for Conservation of Nature), tyres and clothing contribute to 30% of the primary microplastics in the ocean. Today’s tyres are mostly made out of synthetic rubber, a plastic product. Heat and friction with the road cause tyres to slowly erode. Rain and wind will then wash the plastic left on the road into streams and rivers, where it is carried into the ocean. One study found that tyres in the US alone produced 1.8 million tonnes of microplastics every year! 
A worn tire. Illustrating the shedding of microplastics by vehicle tires.

Photo by Sadar Faizan on Unsplash

  1. Road markings are another big contributor. They weather flake off and get washed into the oceans. Microplastics from marine coatings also enter the oceans from weathering or spills. 
  2. Another big culprit is microbeads found in personal care products. They are often added to toothpaste, facial scrubs and shower creams. As these products are used, they are washed into the wastewater system. Where again, they slip through the net of water treatment and end up in our oceans. Where the global currents spread them far and wide. Microplastics in personal care products in most developed countries are now banned. 

As you can see, no matter where microplastics come from it’s not long before they reach the ocean and spread further, causing harm at every step of the journey.

Let’s explore some of the unbelievable places microplastics have been found.  

1. The Deep Sea – A Plastic Graveyard

There’s a popular saying that we know more about the surface of the moon than the depths of our oceans. Yet, despite how little we understand about these remote waters, human activity has already left a devastating mark. A 2024 study estimates that between 3 to 11 million metric tonnes of plastic pollution now rest on the ocean floor . Scientists in Japan have even discovered microplastics in the Mariana Trench, the deepest known place on Earth. 

The problem doesn’t end there. Dr. Eva Ramirez-Llodra and her team calculated that, in the deepest parts of the Mediterranean, the weight of human-made waste outweighs the weight of marine life. Even the most remote corners of the Arctic deep sea are now littered with microplastic pollution, proving that no part of our planet’s oceans is untouched.

We also know that plastic waste and microplastics congregate around certain geological features in the deep sea. Areas such as ridges and canyons become underfloor garbage heaps. Unfortunately, these very areas are critical for the lives of many underwater inhabitants. They provide crucial habitats during key life cycle stages or rich feeding grounds for apex predators. These communities are of great ecological importance and are also particularly vulnerable. 

And unfortunately, this plastic isn’t going anywhere fast. Plastic already takes centuries to degrade at the surface, but in the deep sea, the process slows even further. With no sunlight, minimal erosion, and freezing temperatures, plastic pollution in these depths could persist for thousands of years, continuing to harm marine life for generations to come. 

Want to dive deeper into ocean science? Check out our blog on how coral reefs act like natural shields, protecting our coasts from floods.

Take a closer look at some of these microplastics.

2. Antarctic Sea Ice – A Chilling Discovery

Antarctica is the coldest, highest, driest, and most remote continent on Earth. Its extreme weather and isolation kept it largely untouched by humans until the late 20th century. Even today, it remains a protected wilderness, home only to incredible wildlife and scientific research. Often called the last true wilderness, Antarctica seems to have escaped the obvious plastic pollution that plagues so many coastal regions around the world.

But is this icy paradise truly free from plastic? Unfortunately, the answer is no.

In 2022, scientists discovered microplastics in Antarctic snow for the first time. Researchers identified 29 different types of plastic, with polyester and acrylic fibers, likely from synthetic clothing and outdoor gear, being the most common. These tiny plastic particles are so light they can travel across entire continents through the atmosphere, falling over Antarctica in snow. They are also carried by ocean currents and spread across the land through sea spray.

Even more concerning is the role microplastics may play in accelerating ice melt. As these plastics darken the snow, they reduce its reflectivity, causing it to absorb more heat from the sun and melt faster. This could accelerate rising sea levels, affecting coastal communities worldwide. This also creates a vicious cycle. As the ice melts, it releases even more plastic into the ocean, further worsening the problem.

The impact on wildlife is already being seen. Scientists from the British Antarctic Survey have found microplastics inside Antarctic krill, the tiny crustaceans that form the foundation of the food chain. In 2019, researchers also discovered microplastics in the faeces of gentoo penguins, showing that plastic pollution has reached even the most remote corners of our planet.

Antarctica may still look pristine, but beneath the surface, plastic pollution is taking its toll.

3. Mount Everest – Microplastics at the Top of the World

For decades, Mount Everest has drawn adventurers seeking the ultimate challenge. But this popularity has come at a cost, turning the world’s highest peak into a dumping ground. In recent years, however, efforts by the Nepalese government and the climbing community have helped reduce visible waste. Financial incentives encourage climbers to pack out their trash, while bans on single-use plastics aim to curb pollution. In 2024, Nepalese authorities even removed 11 tons of waste from Everest’s slopes.

Efforts to clean up Everest have made progress, but the visible trash is only part of the problem.

A 2020 study uncovered microplastics just below Everest’s summit, the highest recorded microplastic pollution on Earth. Even more concerning, these tiny plastic particles were found in mountain streams and every snow sample taken from the mountain. Most of these microplastics were fibres from high-performance outdoor clothing, likely shed by climbers. Some may have also been carried by the wind, showing how far plastic pollution can travel.

Despite progress in tackling large-scale waste, these findings highlight a new challenge: cleaning up the invisible plastic contaminating even the most remote and extreme environments on Earth. 

4. Everyday Surprises – In Bottled Water and Sea Salt

If microplastics are everywhere, that means they’re also in our food and drink, and water is the biggest culprit. Microplastics have been found in both tap and bottled water, with bottled water containing nearly twice the amountfound in tap water. One U.S. study discovered that a single liter of bottled water contained almost a quarter of a million nanoplastic particles, even tinier than microplastics. Another study found microplastics in 93% of bottled water samples . However, it remains unclear whether the amount of plastic in our drinking water poses a direct risk to human health.

Microplastics have also been detected in common food products such as beer, salt, and honey. They likely enter food sources in several ways:

  • Contaminated water used in food production.
  • Airborne microplastics settling on food during manufacturing.
  • Plastic packaging leaching microplastics into food.
  • Plastic kitchen utensils shedding particles during meal preparation.
  • Fruits and vegetables absorbing microplastics from soil and air.

As plastic pollution continues to spread, so does its presence in our diet, raising questions about its potential long-term health effects.

5. Human Bodies – Inside Our Brains and Heart

Microplastics have infiltrated every corner of our world, even our own bodies. 

Scientists are now finding microplastics embedded in human tissues, raising serious questions about their potential impact on health:

  • Liver & Heart: Dr. Thomas Horvatits identified microplastics in the livers of patients with liver disease, while researchers in Beijing discovered plastic particles lodged in human heart tissue. 
  • Reproductive System: In 2024, scientists detected 12 different types of microplastics inside human testes. Their findings could suggest a possible link between plastic exposure and declining sperm counts and fertility issues.
  • Breast Milk: Italian researchers have even found microplastics in breast milk, raising concerns about early-life exposure.
  • Placenta: Dr. Matthew Campen from the University of New Mexico analyzed 62 placenta samples and found microplastics in every single one—mostly from the same plastics used in water bottles and shopping bags. While it’s still unclear if these particles pose direct health risks, a 2024 study found that placentas from premature births contained 50% more microplastics than those from full-term pregnancies, hinting at a potential connection.

Microplastics in the Brain

Perhaps most unsettling is the discovery of microplastics in the brain, an organ typically shielded by the blood-brain barrier, a protective filter that keeps harmful substances out. Yet, these tiny plastic fragments seem to slip through the cracks.

A 2025 study examined post-mortem brain samples collected historically and today and found a 50% increase in microplastics over the last eight years. If plastic exposure continues to rise, what does this mean for brain health?

Curious about how the brain works? Don’t miss our blog on the fascinating genetics behind ADHD, dyslexia, and dyscalculia—and why they often go hand in hand.

The Future of Plastic Exposure

One of the biggest concerns is that plastics don’t just disappear. They take decades to degrade, meaning the microplastics in our environment today are likely at least 50 years old. Dr. Campen warns that, at the current rate, microplastic pollution will double every 10-15 years. Even if we stopped producing plastic today, by 2050 there would be three times as much plastic in the environment as there is now. And, as he puts it, “We’re not going to stop it today.”

What Does This Mean for Our Health?

Although this may sound alarming, more research is needed before we know if microplastics directly cause health issues. However, some scientists are beginning to suspect they may contribute to rising rates of certain conditions, such as IBS, colon cancer in people under 50, and declining sperm counts. There have also been suggestions of a link between microplastics and heart attacks.

However, much of the current research suggests correlations rather than direct causation. More studies are needed to understand the long-term consequences of plastic accumulating in our bodies, but the growing presence of microplastics in vital organs, reproductive tissues, and even the brain is raising serious concerns.

Beyond the plastics themselves, the chemicals used in plastic production are a growing concern. These substances may disrupt hormonal systems, potentially affecting fertility, mood, metabolism, and fetal development.

One thing is clear: microplastics are not just an environmental issue. They’re an issue inside all of us.

How can we reduce our microplastic exposure?

Microplastics may seem like an overwhelming problem, but the good news is that we are not powerless. There are simple, everyday actions we can take that not only reduce our plastic exposure but also help protect the environment.

Every small step makes a difference. Choosing reusable over disposable, like carrying a steel or glass water bottleinstead of buying plastic ones, cuts down on waste and reduces our exposure to plastic particles. Swapping plastic kitchenware for wood, glass, or metal utensils is another easy switch. Even our clothing choices matter, opting for natural fabrics instead of synthetic materials can help limit the release of microplastics into the air and water. And when shopping for personal care products, avoiding cosmetics with microbeads ensures we’re not washing plastic down the drain. 

While eliminating plastic from our lives completely is nearly impossible, every small change adds up. And we’re not in this fight alone, scientists around the world are working on groundbreaking solutions to tackle microplastic pollution head-on.

Innovative Science is Leading the Way

  • Researchers have discovered that biochar, a type of charcoal, can remove nearly all microplastics from water when used as a filter.
  • Scientists in China have developed a sponge made from cotton and squid bone that can remove 99.9% of microplastics from water sources.
  • Engineers at the University of Waterloo have even used epoxy- a non-recyclable plastic,  and transformed it into a charcoal-like material capable of capturing 94% of microplastics from wastewater, a remarkable full-circle moment where waste plastic is being used to fight plastic waste!

And scientists are working on increasingly innovative ways to remove microplastics directly from the environment, too!

  • A team in Korea has developed a floating drone that skims microplastics off the surface of water.
  • Other researchers have designed swarms of microrobots capable of removing microplastics and bacteria from contaminated water sources.
  • Inspired by nature, scientists at Cornell University have created a robotic system that mimics a snail’s undulating motion to scoop up microplastics.

A problem as vast as microplastic pollution needs the world’s most innovative thinkers and that’s exactly what we have. With science, technology, and collective action, we have the power to turn the tide on plastic pollution. 

As we’ve explored, microplastics have reached nearly every corner of the planet, from the deep sea to the highest mountain peaks. These tiny particles raise serious concerns not only for the environment but also for our health. But innovative science is emerging to combat this global issue. Researchers around the world are developing groundbreaking technologies to remove microplastics from water sources, from biochar filters to microrobots. These advancements are just the beginning of what promises to be a scientific revolution in our fight against plastic pollution.

Stay ahead of the curve and keep up with the latest in cutting-edge science. Join our newsletter today by clicking the button to the right to get more updates like this, because the future of science is happening right now.

Tonights Dinner Table Discussion

Here are some ideas to spark a fascinating discussion:

  • If you were in charge of solving plastic pollution for the whole planet, where would you start?
  • Should we rethink our relationship with “convenience” if it’s contributing to global plastic pollution?
  • Why do you think it’s so hard to stop using plastic, even when we know the damage it causes?
  • Do you think governments are doing enough to regulate microplastics? What kind of policies might actually work?

Big Family Question:

What small change could we make this week as a family to reduce plastic in our home? Would it really matter?

Looking for more family-friendly discussion prompts? Explore our child-focused version of this blog [here].

Curious but cautious?

Love diving into science, but not always sure what to believe? Grab our free guide:
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And while you are there, join our newsletter to uncover more eye-opening science and what it means for our health and environment.

Keep Exploring

Want to read more surprising environmental science? Explore how rebuilding coral reefs could provide vital protection against food protection.

Or perhaps you want to move from microplastics to microrobots and read about the microrobots fighting lung diseases.

Lets Talk About It

We’d love to hear your thoughts:

  • Did any of the places where microplastics have been found surprise you?
  • What’s one change you could make in your daily life to reduce microplastic pollution, and do you think it would make a real difference?

Let us know in the comment box below.

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