How Microplastic Enter Your Body

Have you ever wondered how microplastics end up inside the human body?

Most people associate plastic pollution with overflowing landfills or floating trash in the ocean. But many don't realize that plastic pollution has become so widespread that tiny plastic particles are now found almost everywhere around us, including in the food we eat, the water we drink, and even the air we breathe.

Fun Fact: According to the World Wildlife Fund, the average person may ingest approximately 5 grams of plastic every week through food, water, and air (roughly the weight of a credit card). While the exact amount is still debated, scientists agree that people are regularly exposed to microplastics from many different sources.

Although it's nearly impossible to avoid microplastics completely in modern society, understanding where they come from can help you make informed choices that may reduce your everyday exposure.

In this blog post, we'll explore the most common ways microplastics enter your body, where they come from, what current research says about their potential health effects, and simple habits that may help reduce your exposure.

What Are Microplastics?

Microplastics are tiny plastic particles that are generally defined as pieces measuring less than 5 millimeters in diameter. To put that into perspective, that's about the size of a sesame seed or smaller. (Many microplastics are so tiny that they cannot be seen with the naked eye!)

These particles are created in two main ways. Some are intentionally manufactured at a microscopic size for use in certain industrial applications and products, while others unintentionally form when larger plastic items gradually break down after years of exposure to sunlight, heat, moisture, and physical wear.

Fun Fact: One scientific study estimated a median exposure of 721 microplastic particles per kilogram of body weight per day. Based on that estimate, an average adult weighing 70 kilograms (154 pounds) could swallow roughly 50,000 microplastic particles every day.

You should be concerned about this because microplastics are now found virtually everywhere people live, and humans are regularly exposed to them through food, water, and air. Researchers have detected microplastics in many parts of the human body, including the blood, lungs, brain, placenta, and even breast milk.

While research on microplastics is ongoing, experts advise minimizing exposure where possible. Since they provide no known health benefit and are widespread in the environment, reducing unnecessary contact is a simple, sensible precaution!

Summary: Microplastics are plastic particles smaller than 5 millimeters that originate either from products manufactured at a tiny size or from larger plastics breaking down over time. And because they are found in food, water, air, and household dust, people are exposed to them every day.

Ingestion (Food & Drink)

Ingestion is currently recognized as one of the main ways microplastics enter the human body. Every day, tiny plastic particles find their way into the food we eat and the beverages we drink. (The amount varies depending on a person's diet and lifestyle!)

Fun Fact: Despite public perception and news headlines often focusing on ocean pollution and microplastics in seafood, fruits, vegetables, and staple grains are estimated to account for approximately 99.5% of the microplastic particles people ingest each day!

Microplastics have also been found in both bottled water and municipal tap water. However, numerous studies have reported that bottled water generally contains higher concentrations of microplastic particles than tap water.

Fun Fact: Researchers believe much of this contamination comes from the plastic bottle itself, as tiny particles can shed from the bottle walls and cap during manufacturing, transportation, storage, and repeated handling.

Microplastics can also enter food during storage and preparation. According to the American Chemical Society, microwaving food in plastic containers can release as many as 4.22 million microplastic and 2.11 billion nanoplastic particles from only one square centimeter of plastic area in just 3 minutes!

Summary: Eating and drinking are among the most common ways people are exposed to microplastics. Tiny plastic particles have been found in bottled water, tap water, food packaging, plastic kitchen tools, seafood, salt, honey, and many other foods.

Inhalation (Air Quality)

Eating and drinking aren't the only ways microplastics can enter the body. Breathing is another important route of exposure.

Scientists have found that both indoor and outdoor air contain microscopic plastic particles suspended in the air. These particles can remain airborne for long periods before eventually settling onto floors, furniture, food, and other surfaces.

Interestingly, researchers have found that indoor environments often contain higher concentrations of airborne microplastics than outdoor environments. And since most people spend around 90% of their time indoors, the air inside homes, offices, and schools, we inhale some of these particles without us ever noticing.

Outdoor air also contains microplastics from a variety of sources.

One of the biggest contributors is tire wear. Modern vehicle tires are made using synthetic rubber and plastic-based materials. As vehicles travel on roads, friction between the tires and asphalt gradually wears away tiny particles. These microscopic fragments become airborne or are washed into nearby soil and waterways by rain.

Scientists estimate that tire wear is one of the largest sources of microplastic pollution worldwide. In busy urban areas with heavy traffic, these airborne particles can contribute significantly to the microplastics people breathe every day.

Summary: Microplastics don't just enter the body through food and water, they can also be inhaled. Airborne plastic particles come from indoor sources such as synthetic clothing, carpets, and furniture, as well as outdoor sources like tire wear, road dust, and weathered plastic waste.

Dermal Absorption (Skin Contact)

Compared with eating, drinking, and breathing, skin contact is currently considered a much less significant pathway for microplastic exposure.

The outer layer of healthy human skin is an excellent protective barrier that prevents most larger particles, including microplastics, from passing through. For this reason, scientists generally believe that simply touching plastic products does not allow significant amounts of microplastics to enter the body.

However, some cosmetics, lotions, sunscreens, glitter, and personal care products can bring plastic particles into direct contact with the skin. In the past, certain facial scrubs, exfoliating cleansers, body washes, and toothpastes contained tiny plastic microbeads that were intentionally added as exfoliants.

But due to growing environmental concerns, many countries have now restricted or banned rinse-off products containing plastic microbeads, although some products sold in certain regions may still contain plastic-based ingredients.

Summary: Because healthy skin can block most larger plastic particles, scientists currently consider ingestion and inhalation to be the dominant routes of microplastic exposure, while dermal absorption is believed to play a much smaller role.

Quick Takeaway

Microplastics have become an unavoidable part of modern life. They can enter the human body through three routes:

1. Ingestion: Eating and drinking contaminated food, water, or beverages from plastic packaging.
2. Inhalation: Breathing in airborne synthetic fibers and urban dust.
3. Skin contact: Absorption of ultrafine particles through cosmetics, lotions, sunscreens, glitter, and personal care products.

Unfortunately, because plastic is now found almost everywhere in the environment, completely avoiding microplastics simply isn't realistic.

My Personal Take: Avoiding microwaving food in plastic containers, keeping indoor spaces clean, replacing heavily worn plastic cutting boards, and saying no to plastic water bottles are a few effective ways I found to reduce exposure.

Frequently Asked Questions About Microplastics Entering Your Body:

Question 1: How do microplastics enter the human body?

Answer: Microplastics mainly enter the body through ingestion (eating and drinking) and inhalation (breathing). Tiny plastic particles have been found in drinking water, seafood, salt, fruits, vegetables, household dust, and the air we breathe.

Question 2: Can your body get rid of microplastics?

Answer: Researchers believe that the body can eliminate at least some microplastics through normal biological processes, such as excretion. However, more research is needed to fully understand how efficiently the human body removes different types and sizes of plastic particles.

Question 3: Does bottled water contain more microplastics than tap water?

Answer: Many studies have found that bottled water generally contains higher concentrations of microplastics than municipal tap water. Researchers believe much of this contamination comes from the plastic bottle and cap during manufacturing, transportation, storage, and everyday handling.

Last Updated: August 7, 2026