The Hidden Health Crisis: The Problems with Microplastics in Food, Water and the Human Body

Microplastics Are Everywhere – Including Inside Us

Microplastics (plastic particles smaller than 5 mm) are now found in soil, rivers, oceans, air, food, drinking water and, increasingly, in human tissues. They arise from the breakdown of larger plastic waste, synthetic textiles, tyres, packaging, personal‑care products and industrial processes, and they travel through wastewater, runoff and atmospheric deposition into the food chain.[1-3]

Evidence from environmental and human studies indicates that microplastic exposure is not a “future problem” but a present‑day reality: these particles are ingested, inhaled and absorbed through the skin, and have been detected in the gut, lungs, blood, placenta and other organs. While long‑term population‑level effects are still being mapped, experimental and epidemiological data point to a range of biological disturbances that cannot be ignored.[1, 4-9]

How Microplastics Enter the Human Body

Humans are exposed to microplastics through three main routes: ingestion, inhalation and dermal contact.[1-3]

• Ingestion occurs via contaminated food and drink, including seafood, salt, bottled and tap water, packaged foods and even dust‑settled produce. Microplastics from synthetic packaging, bottle caps and plastic‑lined containers can leach into liquids and foods, especially when heated (think takeaway coffee cups) or stored for long periods (think tin foods).[2,3,10]

• Inhalation occurs when airborne microfibres from synthetic textiles, tyre‑wear particles, and urban dust are inhaled, particularly in indoor environments with synthetic carpets, clothing, and poor ventilation.[1-3]

• Dermal exposure comes from cosmetics, personal‑care products, and contaminated water, although the extent of absorption through intact skin remains under investigation.[1,8]

Once inside the body, microplastics and their associated chemicals can accumulate in organs, cross biological barriers and interact with cells and tissues in ways that are only beginning to be understood.[4,6,9]

Biological Effects: Inflammation, Oxidative Stress and Organ Damage

A growing body of experimental research shows that microplastics can induce oxidative stress, inflammation, DNA damage and organ dysfunction in cells, organoids and animal models. These effects are driven by both the physical presence of the particles and the cocktail of additives and adsorbed pollutants they carry, including bisphenols (such as BPA), phthalates, heavy metals, and persistent organic pollutants.[1,6,9,11,12]

Key findings include:

• Microplastics can trigger pro‑inflammatory cytokine release (e.g., TNF‑α, IL‑1β, IL‑6), oxidative stress markers and cell‑death pathways in immune and epithelial cells.[1,6]

• Animal studies report liver and lung damage, metabolic disruption, altered lipid profiles and changes in organ development, particularly when exposure occurs during sensitive developmental windows.[1,6,9]

• Nanoplastic‑sized particles (smaller than 1 μm) appear capable of crossing cellular and tissue barriers, including the placenta, raising concerns about maternal–fetal transfer and developmental programming.[6,9]

Human epidemiological data remain limited, but large‑scale reviews suggest that chronic microplastic exposure may be associated with cardiovascular risk, respiratory irritation, gastrointestinal disturbances, and metabolic dysfunction, although causality has not yet been definitively established.[1,8,13] This is also because the study on plastic is still in its infancy, and too many invested parties, preventing the truth of the health hazards microplastics represent from being publicly shared. Plus, the damage may be so severe that it causes chaos, with nothing to replace plastics.

“In combination with other dietary and lifestyle stressors, microplastic‑induced dysbiosis may exacerbate inflammatory bowel disease, irritable bowel syndrome, metabolic syndrome and autoimmune conditions.”

Microplastics, the Gut Microbiome and Digestive Health

One of the most clinically relevant frontiers is the impact of microplastics on the gut microbiome and intestinal barrier. Experimental work shows that exposure to common polymers such as polyethylene (PE), polystyrene (PS), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and polylactic acid (PLA) can:

• Alter microbial composition, reducing beneficial genera and enriching pathogenic or pro‑inflammatory species.

• Impair short‑chain fatty acid (SCFA) production, which is critical for gut‑barrier integrity, immune regulation and metabolic health.

• Disrupt tight junctions and increase intestinal permeability, potentially contributing to low‑grade inflammation, food‑sensitivity patterns and conditions linked to “leaky gut.”

In combination with other dietary and lifestyle stressors, microplastic‑induced dysbiosis may exacerbate inflammatory bowel disease, irritable bowel syndrome, metabolic syndrome and autoimmune conditions, although human‑intervention trials are still lacking.[7,9]

Endocrine Disruption and Reproductive Health

Microplastics and their chemical additives are recognised as endocrine‑disrupting chemicals (EDCs) that can interfere with hormone signalling pathways. Studies in animals and human‑cell models show that micro‑ and nanoplastics can:

• Disrupt thyroid hormone homeostasis, potentially contributing to subclinical hypothyroidism and altered metabolic rate.[6]

• Impair ovarian follicular development, increase ovarian fibrosis and alter the oestrous cycle, with implications for fertility and reproductive ageing.[6]

• Affect testicular function, sperm quality and hormone balance in males, again largely through oxidative stress and inflammatory mechanisms.[6,12]

These findings are particularly concerning for pregnant women, children and adolescents, whose endocrine and immune systems are still developing and may be more vulnerable to low‑dose, chronic exposure.[6,8]

Cardiovascular, Respiratory and Systemic Risks

Emerging evidence also links microplastics to cardiovascular and respiratory effects. A 2024 study suggested that microplastics and nanoplastics may be emerging risk factors for atherosclerosis, heart attack, stroke and cardiovascular‑related mortality, possibly via chronic inflammation, endothelial dysfunction and lipid‑metabolism changes. In the lungs, inhaled microfibres and particles can deposit in the airways and alveoli, triggering local inflammation and oxidative stress that may worsen asthma, chronic obstructive pulmonary disease (COPD), and other respiratory conditions.[1,11,13]

Because microplastics can carry adsorbed pollutants and pathogens, they may also act as vectors for bacteria, viruses and toxic chemicals, amplifying their biological impact beyond the plastic itself.[2,3]

“Humans are ingesting and inhaling more microplastics than at any time in recorded history. A study published in 2024 confirmed that consumption of the particles has increased sixfold since 1990, particularly in hotspots including the US, China, parts of the Middle East, North Africa and Scandinavia.”

Bone Health

A 2024 study by Chinese researchers detected microplastics in the bone and muscle tissue of patients who had undergone joint replacements. The scientists warned that this contamination could potentially impair physical function, noting that other research has found certain microplastics can hinder the development of bone and muscle cells.

What About the Brain?

Microplastics are a global concern. In February 2025, a team of scientists detected microplastics in human brain tissue. Strikingly, the brains of individuals who had dementia at the time of their death contained up to ten times more plastic than those without the condition.[16]

“The greater concern is where they are ending up, and are they accumulating somewhere? It’s very unlikely that our body is capable of completely breaking them down. And can that lead to things like chronic inflammation and tissue scarring which compromises the function of organs?
… those who had been diagnosed with dementia prior to their death had up to 10 times as much plastic in their brains compared to those without the condition”

— Stephanie Wright, Researcher at Imperial College London

Regulatory Gaps, Uncertainty and Precaution

Despite mounting evidence, major regulatory bodies still classify microplastics as an “emerging pollutant” despite significant data gaps. The European Environment Agency, for example, acknowledges that while microplastics are widespread and chemically complex, the precise thresholds for human health risk remain unclear (thanks to intense lobbying). This uncertainty has not stopped some jurisdictions from taking precautionary steps, such as restricting certain non‑degradable polymer microparticles in consumer products and developing new standards for detecting microplastics in drinking‑water supplies.[1,8,14]

For clinicians and patients, this means that absolute safety thresholds cannot yet be defined, but the precautionary principle — minimising exposure where feasible — is increasingly justified by the weight of mechanistic and observational data.[1,6,8]

What Can Practitioners and Patients Do?

From a functional‑medicine perspective, the focus should be on reducing exposure, supporting detoxification pathways and protecting barrier and immune function. Practical steps include:

• Choosing glass, stainless steel or ceramic containers over plastic, especially for hot foods and liquids.[2,3] Never heating food in plastic containers or covered with plastic wrap, especially when heated in microwaves.

• Filtering drinking water and being mindful of bottled water, given documented microplastic contamination in both tap and bottled supplies.[10,14]

• Reducing synthetic‑fibre clothing and indoor plastics where possible, and improving ventilation to lower airborne microfibre load.[1,3]

• Supporting gut health with a diverse, fibre‑rich, low‑ultra‑processed diet, adequate hydration and targeted probiotics or prebiotics, which may help mitigate microplastic‑associated dysbiosis and inflammation.[7,9]

Microplastics are a systemic, cross‑sectoral challenge that intersects with nutrition, toxicology, endocrinology and public health. As research continues to clarify their role in chronic disease, clinicians who understand the mechanisms and exposure routes will be better positioned to guide patients toward safer choices and more resilient physiology.

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References

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2. De-la-Torre, GE. (2020). Microplastics: An emerging threat to food security and human health. Journal of Food Science and Technology. 57(5), pp. 1601-1608. doi:10.1007/s13197-019-04138-1

3. Emenike, EC. Okorie, CJ. Ojeyemi, T. et al. (2023). From oceans to dinner plates: The impact of microplastics on human health. Heliyon. 9(10), e20440. doi:10.1016/j.heliyon.2023.e20440

4. Savchuk, K. (2025). Microplastics and our health: What the science says. Stanford Medicine. Available at: https://med.stanford.edu/news/insights/2025/01/microplastics-in-body-polluted-tiny-plastic-fragments.html. [Accessed: 30 Jan. 2026]

5. Balch, B. (2024). Microplastics are inside us all. What does that mean for our health? AAMC. Available at: https://www.aamc.org/news/microplastics-are-inside-us-all-what-does-mean-our-health. [Accessed: 30 Jan. 2026]

6. Tyc, HJ. Kłodnicka, K. Teresińska, B. et al. (2025). Micro- and nanoplastics as disruptors of the endocrine system: A review of the threats and consequences associated with plastic exposure. International Journal of Molecular Science. 26(13), 6156. doi:10.3390/ijms26136156

7. Thin, ZS. Chew, J. Ong, TYY. et al. (2025). Impact of microplastics on the human gut microbiome: A systematic review of microbial composition, diversity, and metabolic disruptions. BMC Gastroenterology. 25(1), 583. doi:10.1186/s12876-025-04140-2

8. European Environmental Agency. (2025). Impacts of microplastics on health (Signal). Available at: https://www.eea.europa.eu/en/european-zero-pollution-dashboards/indicators/impacts-of-microplastics-on-health-signal. [Accessed: 30 Jan. 2026]

9. Bora, SS. Gogoi, R. Sharma, MR. et al. (2024). Microplastics and human health: Unveiling the gut microbiome disruption and chronic disease risks. Frontiers in Cellular and Infection Microbiology. 14, 1492759. doi:10.3389/fcimb.2024.1492759

10. Al-Mansoori, M. Stephenson, M. Harrad, S. et al. (2025). Synthetic Microplastics in UK tap and bottled water; Implications for human exposure. Emerging Contaminants. 11(1), Article 100417. doi:10.1016/j.emcon.2024.100417

11. Dutchen, S. (2023). Microplastics Everywhere. Harvard Medicine Magazine. Available at: https://magazine.hms.harvard.edu/articles/microplastics-everywhere. [Accessed: 30 Jan. 2026]

12. Ullah S, Ahmad S, Guo X, Ullah S, Ullah S, Nabi G, Wanghe K. A review of the endocrine disrupting effects of micro and nano plastic and their associated chemicals in mammals. Front Endocrinol (Lausanne). 2023 Jan 16;13:1084236. doi: 10.3389/fendo.2022.1084236. PMID: 36726457; PMCID: PMC9885170.

13. Marfella, R. Prattichizzo, F. Sardu, C. et al. (2024). Microplastics and nanoplastics in atheromas and cardiovascular events. New England Journal of Medicine. 390(10), pp. 900-910. doi:10.1056/NEJMoa2309822

    Global Plastic Action Partnership. (2024). Microplastics: Are we facing a new health crisis – and what can be done about it?

14. British Standards Institution. (2025). Water quality. Sampling - Guidance on sampling for microplastics in water. Available at: https://knowledge.bsigroup.com/products/water-quality-sampling-guidance-on-sampling-for-microplastics-in-water. [Accessed: 30 Jan. 2026]

15. Cox, D. (2025). How do the microplastics in our bodies affect our health? BBC Future. Available at https://www.bbc.com/future/article/20250723-how-do-the-microplastics-in-our-bodies-affect-our-health. [Accessed: 30 Jan. 2026]

16. Nihart, AJ. Garcia, MA. El Hayek, E. et al. (2025). Bioaccumulation of microplastics in decedent human brains. Nature Medicine. 31, pp. 1114–1119. doi:10.1038/s41591-024-03453-1