How many microplastics enter our bodies daily?

How Many Microplastics Enter Our Bodies Daily?

⚕️ MEDICAL DISCLAIMER: This article is for informational and educational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any changes to your health regimen, diet, or supplement use, especially if you have existing medical conditions or take medications. The information presented here should not be used to diagnose, treat, cure, or prevent any disease.

Nearly every breath of air, every sip of water, and every bite of food adds microplastics to our bodies. While most microplastics pass through us, they can remain trapped in our bodies for extended periods of time. Microplastics are now recognized as unavoidable dietary and respiratory exposures, and are accumulating in our bodies at unprecedented rates. While scientific estimates vary depending on methodology and geography, the key takeaway is that we ingest and inhale hundreds to thousands of microplastics every single day [1–13].

How Many Microplastics Do We Eat And Drink Daily? 

One of the most consistent pathways of microplastic intake is ingestion. Studies suggest that adults consume between 550 to 1,000 particles daily through food and beverages, while children ingest around 550 per day [2, 11]. Other models estimate between 74,000 and 121,000 microplastics from ingestion and inhalation annually, with ingestion representing a substantial fraction [1].

Water is also a primary contributor to microplastic intake. Tap water alone may account for 458,000 particles annually, while bottled water increases this dramatically to 3.6 million particles per year [6]. Another analysis estimated adults consume 704 to 880 microplastics daily from water alone, equating to 250,000 to 320,000 per year [13]. 

Our foods are also a major contributor to microplastic intake. Fruits and vegetables contribute between 448,000 and 462,000 particles annually, while seafood, salt, and processed foods add tens of thousands more [4]. A study in China estimated 187,000 to 328,000 particles annually from food intake alone [13]. As mentioned above, staples like table salt are routinely found contaminated, with microplastics detected across global brands [7]. Altogether, humans may ingest 0.1–5 grams of plastic weekly via food and drink [1, 10, 12]. Annually, this may be 5 to 260 grams, or a one nickel to 50 nickels – or a stick of butter. 

Microplastic Inhalation as a Daily Exposure

We also breathe in microplastics. Indoors, where synthetic textiles, like polyester clothing and blankets, and household materials constantly shed fibers. Airborne microplastic concentrations are high enough that a person may inhale 272 airborne microplastics per day [1]. Broader inhalation estimates range from 132 to 170 particles per day depending on sex [14], while more sensitive measurements place daily averages at 594 ± 269 particles [2].

Annualized, this represents 192,000 to 335,000 inhaled particles [13]. Other models are even more striking, estimating between 210,000 and 2.5 million particles annually, with the majority coming from indoor air [4]. A study in Shanghai found that exposure was estimated at 21 inhaled microplastics daily [13], but this likely underestimates true burden given regional differences in pollution, indoor environments, and the method of particle detection. One study concluded that microfibers are inhaled three to fifteen times more frequently than they are ingested, underscoring the primacy of airborne exposure [17].

Importantly, these particles don’t simply pass through our lungs. Depending on size, shape, and surface chemistry, microplastics deposit in different regions of the respiratory tract [15]. Smaller nanoplastics can reach down into the small parts of the lungs, the alveoli, where they interact with our immune cells and cause inflammation. Over time, inhaled plastics accumulate, compounding with dietary intake to create a continuous, lifelong body burden.

Differences in Microplastic Consumption by Age and Lifestyle

Infants and children may face higher exposure levels than adults, relative to body weight [9, 16]. Feeding bottles made of plastic, when exposed to heat, can release millions of particles per liter of formula [9]. Early-life exposure is particularly concerning given the developmental sensitivity of endocrine, immune, and neural systems. 

College-age students in Changsha, China, were measured to ingest 346.65 μg/kg body weight daily through food and water, and inhale 59.57 μg/kg daily through air [13]. These values suggest that microplastic exposure scales with both diet and environment, with urban dwellers experiencing higher rates due to air pollution, indoor dust, and reliance on packaged foods. Lifestyle habits, from choice of water source to time spent indoors, may alter daily microplastic intake significantly.

Methodological Variability and Uncertainty

Differences in reported microplastic intake, whether through food, air, or water, arise primarily from the methods used to detect microplastics, which range from visual microscopy to spectroscopic imaging [6]. Studies may report exposure in particle counts, weight per kilogram of body mass, or grams per week, making direct comparisons difficult [13]. For example, studies assessing microplastics in bottled water have found results of one microplastic particle per liter up to 2,600 microplastics per liter, with recent studies even saying 54,000,000 microplastic particles per liter. The range is immense. Nonetheless, all methods converge on the same conclusion: humans are continuously and significantly exposed to microplastics. 

What remains unknown is the precise toxicological threshold. Unlike heavy metals or known carcinogens, microplastics lack standardized safety limits. The endocrine system’s sensitivity to trace exposures complicates matters further, as adverse outcomes may emerge even at very low doses [16, 20]. Until harmonized methodologies provide global baselines, current estimates should be viewed not as exaggerations but as conservative undercounts.

A Daily Accumulation

The reality is that we ingest and inhale hundreds to thousands of microplastics every day, adding up to millions each year. Drinking bottled water, eating fruits and vegetables, inhaling fibers from household dust, and more can all contribute to a cumulative load that persists in our bodies. 

Every day, you breathe, eat, and drink plastic. Not occasionally, not by accident, but systematically—through the air in your home, the water you drink, and the food on your plate. While it’s extremely difficult, if not impossible, to avoid microplastics, there are many small, simple actions that you can take each day to lower the amount of microplastics you consume. This is why we developed the Deplasto platform. 

Our platform, consisting of a scientifically-supported nutritional supplement, a microplastic intake app, and lifestyle recommendations is intended to help you avoid microplastics. Our supplement, that contains ingredients studied alongside microplastics, is formulated to support your body’s natural detoxification defenses, including oxidative stress management, cellular repair, and antioxidant support. Our microplastic intake app is designed to show you an estimate of your daily exposure, with every datapoint backed by scientific studies, to help you understand how you can best avoid microplastics. Lastly, given that it’s nearly impossible to completely avoid microplastic exposure, we have a plethora of lifestyle recommendations designed to help you make small changes for big impacts. 

Overall, we believe that the best way to eliminate microplastics begins with you and the changes you make to your daily life. Over time, collectively, we can make a significant difference in your health and the environment.

Sources

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2. Deciphering the cytotoxicity of micro- and nanoplastics in Caco-2 cells through meta-analysis and machine learning
3. Human Exposure to Microplastics and Its Associated Health Risks
4. Impact of Microplastics and Nanoplastics on Human Health
5. Integrating aggregate exposure pathway and adverse outcome pathway for micro_nanoplastics- A review on exposure, toxicokinetics, and toxicity studies
6. Micro(nano)plastics and Their Potential Impact on Human Gut Health- A Narrative Review
7. MicroRaman spectroscopy detects the presence of microplastics in human urine and kidney tissue
8. Microplastics in indoor and outdoor environments in China- Characteristic and human exposure risk assessment
9. Microplastics- Human exposure assessment through air, water, and food
10. Chronic Polystyrene Microplastic Exposure Reduces Testosterone Levels in Mice through Mitochondrial Oxidative Stress and BAX_BCL2-Mediated Apoptosis
11. A systematic review and quality assessment of estimated daily intake of microplastics through food
12. Invisible but Insidious Effects of Microplastics
13. Internal and external microplastic exposure in young adults- A pilot study involving 26 college students in Changsha, China
14. Mechanism of circRNA_SMG6 mediating lung macrophage ECM degradation via miR-570-3p in microplastics-induced emphysema
15. Inhalation of Microplastics-A Toxicological Complexity
16. Microplastics dysregulate innate immunity in the SARS-CoV-2 infected lung
17. Microfiber Emissions from Functionalized Textiles- Potential Threat for Human Health and Environmental Risks