Overview
Here is something that should be making bigger headlines.
In 2024, researchers at the University of New Mexico tested human testicular tissue samples for microplastics. They found microplastics in every single human testicle they examined.
And then in 2025, a follow-up study found microplastics in 34 out of 45 semen samples with men who had the most plastic detected in their semen showing sperm motility of approximately 21%, compared to 35% in men without plastic detected.
That gap in motility is not a small number. In fertility terms, it is significant!
Global sperm counts dropped 62% between 1973 and 2018, and testosterone levels in young men have been declining steadily for decades. For years, the usual explanations were lifestyle-related sedentary jobs, poor diet, stress. Those factors are real. But the growing body of research on microplastics and hormone-disrupting chemicals suggests something deeper is also at play.
Something most men are not thinking about when they pour water from a plastic bottle or heat food in a plastic container.
What are microplastics and how do they get inside the body?
Microplastics are tiny plastic particles, smaller than 5 millimetres that break off from larger plastic objects over time. They have saturated our environment so thoroughly that they now appear in drinking water, packaged food, seafood, table salt, indoor air and agricultural soil.
The body absorbs them through eating, drinking and breathing.
Beyond reproductive tissue, microplastics have been confirmed in human blood, placenta, lungs, uterus, testes, semen, breast milk and ovarian follicular fluid with exposure linked to cardiovascular events, reproductive damage, inflammatory responses and oxidative stress.
Once inside the body, microplastics do not just sit passively. They carry chemical additives: plasticisers, stabilisers, flame retardants, that actively interfere with the body’s hormonal signalling. These chemicals are what scientists call endocrine-disrupting chemicals or EDCs.
And for male fertility specifically, they cause damage at a level most people do not realise.
How endocrine disruptors quietly dismantle sperm production?
To understand the damage, it helps to understand how sperm is actually made.
Healthy sperm production (spermatogenesis) depends on a precise hormonal chain. The brain sends signals through two key hormones: FSH (follicle-stimulating hormone) and LH (luteinising hormone). LH travels to the testes and tells specialised cells called Leydig cells to produce testosterone. The testes need very high concentrations of testosterone locally, inside the testicular environment itself, to drive the production of healthy, motile sperm.
When that chain gets disrupted, sperm production falters quietly, gradually, without obvious external symptoms.
This is exactly what common endocrine disruptors like BPA and phthalates do.
BPA decreases the pituitary secretion of LH, which in turn reduces stimulation of Leydig cell testosterone production, lowering the intratesticular testosterone levels that play a critical role in spermatogenesis. Beyond this, BPA directly damages Sertoli cells, the cells that physically support developing sperm causing mitochondrial dysfunction, DNA damage and disruption of the blood-testis barrier.
Phthalates, which are present in plastics and many personal hygiene products, inhibit steroidogenic enzymes, the proteins that drive testosterone synthesis, with animal studies showing up to 40% reductions in serum testosterone and significant impairments in spermatogenesis.
Multiple studies have reported significant reductions in serum testosterone, LH and inhibin B following phthalate exposure including a crossover study where men newly exposed to a phthalate-containing medication experienced a 13.9% decrease in LH levels, indicating suppression of the entire hormonal axis that drives sperm production.
The result is a hormonal environment that looks normal on the surface, normal testosterone in the bloodstream but is compromised where it matters most: inside the testes where sperm development actually happens.
Multi-centre cohort data documents a 42.3% decline in sperm concentration and a 85.4% increase in sperm DNA fragmentation among men with elevated endocrine disruptor exposure, alongside a 28.5% suppression of testosterone and 45.2% elevation of FSH in exposed populations.
When FSH rises abnormally, it is the body’s signal that the testes are not functioning properly. It is trying to compensate. That compensation itself tells the story.
The everyday sources you are probably not thinking about
This is where science becomes practical.
The chemicals doing this damage are not confined to industrial settings. They are in products most men interact with every single day.
Plastic food containers and bottles, especially when heated or scratched, leach BPA and phthalates directly into food and drinks. Microwaving food in plastic packaging is one of the highest-exposure scenarios.
Personal care products: Shampoos, body washes, deodorants and synthetic fragrances routinely contain phthalates as stabilisers. These absorb through the skin.
Canned foods: Most can linings still use BPA-based epoxy resins. Eating from cans regularly adds to cumulative exposure.
Thermal paper receipts are routinely coated with BPA. Handling them transfers measurable amounts through the skin within seconds.
Pesticide residues: In India, agricultural chemical usage is very high. Organophosphate pesticides are known endocrine disruptors with documented effects on sperm quality.
Non-stick cookware: Older or scratched non-stick pans release PFAS compounds, another class of endocrine disruptors with long biological half-lives and documented hormonal effects.
The exposure is cumulative. No single source causes dramatic damage overnight. But years of combined, daily exposure, from multiple sources simultaneously builds up in tissue and blood in ways the body cannot easily clear.
The broader picture of how environmental toxins affect both male and female fertility is explored in depth in this guide on how environmental toxins affect fertility in men and women, a useful read for couples who want to understand the full environmental picture.
Practical steps to reduce your exposure
You cannot eliminate microplastics and endocrine disruptors entirely. They are too widespread for that. But reducing your daily load meaningfully is achievable and the research suggests it matters.
Switch to glass, stainless steel or ceramic for food storage and cooking. These materials do not leach chemicals regardless of temperature.
Filter your drinking water using a high-quality activated carbon or reverse osmosis filter. Tap water and most bottled water contain measurable microplastic contamination.
Read labels on personal care products. Avoid anything listing phthalates, parabens or synthetic fragrance. Fragrance on a label is often a cover term for a mixture of undisclosed chemicals.
Eat fresh, over packaged. Traditional Indian cooking (idly, dhal, chappatti) is inherently lower in plastic-derived chemical exposure compared to packaged or heavily processed food.
Choose organic produce where possible for items with high pesticide residue rates, particularly leafy greens, tomatoes and apples.
Smoking compounds the damage significantly. The combination of environmental toxin exposure and smoking creates a synergistic effect on sperm quality that is meaningfully worse than either factor alone. If you are thinking about fertility, understanding how smoking affects sperm quality is a critical companion to understanding microplastic exposure, the two often operate together.
When to seek specialist evaluation?
Reducing exposure is a meaningful lifestyle step. But it is not a substitute for medical evaluation when fertility is a concern.
Hormonal disruption from endocrine disruptors does not always produce obvious symptoms. Testosterone may appear normal in a standard blood test while intratesticular levels are compromised. Sperm counts may be within the lower range of normal while DNA fragmentation, which is not part of a basic semen analysis, is significantly elevated.
A thorough male fertility evaluation goes beyond the basic semen analysis. At a dedicated fertility hospital in Chennai, assessment includes sperm DNA fragmentation testing, hormonal profiling covering FSH, LH and intratesticular testosterone pathways and a complete review of environmental and lifestyle exposure history.
Because the damage from microplastics and endocrine disruptors is not visible from the outside.
It shows up in the numbers, when you look at the right ones.
At the best fertility hospital in Chennai, male fertility is taken as seriously as female fertility. The investigation is thorough. The interpretation is specific. And the treatment plan reflects what is actually happening inside the body, not just what a surface-level test suggests.
The bottom line
Microplastics are real. Endocrine disruptors are real. Their effects on FSH, LH and intratesticular testosterone and therefore on sperm production are documented, peer-reviewed and increasingly impossible to ignore.
The good news is that sperm cells are replaced approximately every 74 days. That means the damage is not permanent. Meaningful lifestyle changes, reduced exposure and the right medical support can improve sperm quality over several cycles.
The plastic in your environment does not have to define your fertility.
However, the first step is simply being aware of it.
