Unequal risk isn’t just a statistic. It’s a pattern.
And when Māori are both more likely to be exposed to glyphosate through their work and more likely to suffer aggressive, early-onset bowel cancer, we have to ask why no one’s connecting the dots.
Editor’s Note:
This article explores a confronting question: could glyphosate exposure be contributing to the rising colorectal cancer rates seen in young Māori? It’s not an easy conversation — but neither is watching warning signs go unaddressed.
Our focus is systemic — not cultural. We’re asking why protections have failed, who benefits from inaction, and what it will take to ensure no one is left carrying the burden of someone else’s decisions.
Colorectal cancer used to be something people worried about later in life. Today, that’s changing — and not for the better. The number of Māori under 50 diagnosed with bowel cancer is rising faster than any other demographic. At the same time, Māori are overrepresented in industries where glyphosate-based herbicides like Roundup are sprayed regularly, often with little oversight, inconsistent training, and minimal protective gear.
This isn’t about pointing fingers at workers, employers, or culture. It’s about a system that quietly normalizes exposure — and then acts surprised when health disparities emerge.
Today, the stakes are higher than ever. The New Zealand government is proposing a 9900% increase in allowable glyphosate residues on key food crops — a move that could further embed chemical exposure into everyday diets.
At the same time, our independent testing has detected glyphosate residues in mānuka honey, one of the country’s most iconic and trusted products. And new research reveals that Māori patients face significantly higher death rates following colorectal cancer surgery — highlighting a much wider pattern of unequal risk that spans environmental exposure, workplace conditions, and institutional outcomes.
If Māori are both more exposed and less protected — in the field and in the hospital — then what we’re facing isn’t just a health issue. It’s a justice issue.
This article isn’t here to make claims it can’t prove. It’s here to spotlight a pattern too obvious to ignore — and to ask whether the silence around glyphosate and cancer is protecting public health, or protecting something else entirely.
Note on terminology:
In this article, we use “colorectal cancer” to reflect its medical classification, while also referencing “bowel cancer” in line with how it is discussed in many New Zealand public health documents.
When the Numbers Start Pointing
Colorectal cancer is no longer just a disease of old age. In New Zealand, the number of people under 50 being diagnosed with bowel cancer is steadily rising. And the burden is not falling evenly.
Among Māori under 50, early-onset colorectal cancer (EOCRC) has increased by 36% per decade. That’s well above the national average of 26%. Māori now account for 18% of EOCRC cases, despite making up only around 16–17% of the total population.
These aren’t just numbers. They represent whānau members being diagnosed younger, often at later stages, with more aggressive disease — and with less chance of early detection through screening.
The situation is so serious that public health experts have recommended lowering the national screening age to 40 for Māori and Pacific peoples. But screening alone can’t solve the problem. We also have to ask: what’s contributing to the rise in cases in the first place?
That means looking beyond genetics or diet — and asking whether everyday environmental exposures, including in the workplace, might be playing a much larger role than anyone’s been willing to admit.
A Different Kind of Exposure
We often talk about glyphosate exposure as something that happens through food — trace residues on cereal or bread, glyphosate drift near homes, or contamination of local water supplies. But for many Māori, glyphosate isn’t just a background exposure. It’s part of the job.
From council maintenance crews to rural contractors, orchard workers to roadside sprayers, Māori are overrepresented in roles that involve direct contact with glyphosate-based herbicides like Roundup®. These jobs are often casual, physically demanding, and carried out in conditions where safety protocols vary widely — if they exist at all.
Training can be rushed. Gloves get reused. Long sleeves are abandoned in the summer heat. Face shields? Often not even issued.
And here’s the uncomfortable truth: protective equipment isn’t always worn — not just because it’s unavailable, but sometimes because of a cultural code around toughness, not showing weakness, and getting the job done. In some crews, there’s a quiet bravado at play: “She’ll be right.” Wearing full PPE might be seen as excessive or even “girly” — and in a fast-moving, mostly male workforce, that perception can carry real weight.
This won’t apply to every crew, every job, or every worker. Some are well-trained and properly equipped. But we’ve heard enough consistent stories — from broken face shields to borrowed gloves and minimal induction — to know these aren’t isolated incidents. And it’s not exclusive to Māori. Unsafe spraying practices and patchy PPE standards affect a wide range of workers across industries. But when Māori are disproportionately placed in these jobs, and already face higher rates of related illness, the impact becomes even harder to ignore.
If those gaps continue — and if the people standing in them are mostly Māori — then we can’t keep pretending this is a level playing field. This isn’t just environmental exposure. It’s occupational. It’s uneven. And it’s being ignored.
What Glyphosate Has to Do With the Gut
Glyphosate is the most widely used herbicide in the world — and the active ingredient in weedkillers like Roundup. It’s also classified as a probable human carcinogen by the World Health Organization’s International Agency for Research on Cancer (IARC).
Regulators often assure us that glyphosate is harmless to humans because it targets plant-specific pathways—but that reasoning neglects a crucial truth: our gut microbiome relies on those same pathways.
Research now clearly shows that over half of human gut bacteria are intrinsically sensitive to glyphosate, and that exposure can lead to disruptions in microbiome composition, gut integrity, metabolism, and immune regulation—all critical factors in colorectal health.
But the biological risk isn’t limited to the gut. A major long-term animal study has demonstrated that glyphosate and its formulations produce statistically significant, dose-related increases in tumors across a wide array of organs—kidney, liver, thyroid, nervous tissue, and more—even at exposure levels deemed “safe” by EU standards.
Further, new molecular modeling and toxicology research have pinpointed how glyphosate may impact kidney health through direct binding to key enzymes (like matrix metalloproteinases), potentially triggering tumor growth or kidney injury.
This convergence of mechanistic, microbiome, and carcinogenic findings makes the safety argument increasingly tenuous. The scientific signal is clear: glyphosate may be disrupting life-sustaining systems, even at exposure levels that regulatory agencies currently call harmless.
If there’s growing proof that glyphosate undermines the microbiome, targets vital enzymes, and accelerates tumor formation—with a stubborn lack of data on the most exposed populations—choosing to keep treating it as safe is no longer a defensible position.
Connecting the Dots — What We Know (and Don’t Know)
To date, no human study has directly linked glyphosate exposure to colorectal cancer. Most of what we know comes from three sources: studies of broader pesticide exposure (not glyphosate-specific), mechanistic research on gut microbiome disruption, and animal studies showing increased tumour rates.
These findings don’t prove causation — but they raise enough red flags to warrant closer scrutiny, especially in the context of chronic exposure, systemic inequities, and rising cancer rates among younger Māori. We’re not claiming glyphosate causes colorectal cancer, but we are asking why no one seems to be looking more closely.
Where’s the Protection?
If glyphosate was only entering our bodies through food, at trace levels, the debate would already be difficult enough. But for many workers — especially in outdoor, agrichemical-heavy industries — exposure isn’t occasional or accidental. It’s routine.
And still, New Zealand has no formal glyphosate exposure monitoring program for workers. No urine testing. No air sampling. No dermal absorption tracking. Not even a national database of who’s applying how much, where, and how often.
For a chemical applied in such vast quantities across councils, railways, orchards, and roadsides — this kind of regulatory silence is staggering.
Spray contractors and outdoor workers are expected to manage risk through label instructions and self-protection. But how can workers protect themselves if the system doesn’t back them up with training, supervision, or data?
The truth is, we’ve normalised glyphosate exposure in the workplace while failing to track what it might be doing to the people closest to it.
And for many of those workers — especially Māori — there are additional barriers. Protective gear is often inadequate or poorly maintained. PPE protocols are inconsistently enforced. And cultural attitudes around toughness and endurance can make it harder to speak up when something feels unsafe.
This isn’t a criticism of those workers — it’s a criticism of the system that leaves them carrying the risk without the information, support, or policy protections they deserve.
Meanwhile, regulators continue to assess glyphosate safety using models that ignore occupational exposure altogether — or treat it as something controllable by the user, without questioning whether the system around that user is working.
If you’re exposed to glyphosate every week at work, but the only protections are a faded label and a thin pair of gloves — who’s responsible when something goes wrong?
It shouldn’t be the worker.
Systems Failing Those Most at Risk
The problem isn’t just what glyphosate might do to the body. It’s also about who gets exposed, who gets ignored, and who gets protected — or doesn’t.
When Māori are more likely to be in glyphosate-heavy jobs, and more likely to be diagnosed with colorectal cancer at a younger age, we can’t treat these things as separate issues. Add in the latest findings that Māori are more likely to die following colorectal cancer surgery, and the pattern becomes harder to ignore.
This is a public health issue. But it’s also a systems issue.
From training gaps to poor PPE oversight, from exposure monitoring failures to unequal access to early diagnosis and care — the entire pipeline is skewed. And while glyphosate exposure might not be the sole cause of rising EOCRC rates among Māori, it’s a risk factor hiding in plain sight, wrapped in a regulatory silence that treats workers as collateral.
This silence doesn’t affect everyone equally. It tends to fall hardest on those doing the least talking — and the most spraying.
If the people with the highest exposure are also the ones least likely to be protected, studied, or heard… then who is our safety system really designed to protect?
The science may still be evolving. But the social pattern is already here. And unless we’re willing to look at the whole picture — not just the chemical, but the conditions around it — we’re not doing public health. We’re doing damage control.
A Call for Real Accountability
We cannot wait for the courtroom version of this story before we start asking questions. In the U.S., lawsuits over glyphosate have already led to billions in payouts — mostly for non-Hodgkin lymphoma. But here in New Zealand, the story may look different.
The risk we’re facing may not be one dramatic disease, but a slow, systemic erosion of health, playing out in the gut, the kidneys, and the early cancer wards of hospitals that too often fail Māori when it matters most.
We need to stop pretending that risk management begins and ends with what’s written on a product label.
Real accountability means asking: who is measuring exposure? Who’s watching the outcomes? Who’s protecting the most exposed? And who benefits from not knowing the answers?
It’s time for:
- Occupational monitoring of glyphosate exposure in high-risk workers
- Transparent health tracking across industries where agrichemical use is routine
- Targeted education and PPE support designed with, not just for, Māori
- Independent, Māori-led research into the long-term health effects of exposure
- Re-examination of regulatory thresholds, especially for products widely used in public spaces and food production
No one’s saying glyphosate is the only factor driving colorectal cancer rates in Māori communities. But given what we now know — and what regulators continue to ignore — the failure to act is no longer just negligence. It’s a choice.
Who’s Watching the Front Line?
We can no longer talk about glyphosate as if it’s just about food residues or backyard weeds.
For some, it’s personal. It’s occupational. It’s unavoidable.
It’s the quiet spray around your boots each week. It’s the residue on your gloves. It’s the job you keep because it puts kai on the table, even if the label says “avoid skin contact” and no one gives you a proper face shield.
And when those same workers are among the most likely to develop bowel cancer earlier in life — and among the least likely to survive it — the silence becomes deafening.
Glyphosate isn’t just a chemical. It’s a lens through which we can see whose health matters, and whose doesn’t.
We talk about risk as if it’s an individual choice. But in reality, some people are handed more risk than others — through the jobs they’re offered, the protection they’re not given, the diseases they’re more likely to face, and the institutions that still haven’t learned to listen.
It’s time we stopped pretending this is accidental.
If Māori workers are exposed more often, diagnosed earlier, treated later, and protected less — then who, exactly, is watching the front line?
Because if it’s not the regulators, not the employers, and not the health system, then maybe — it has to be us.
Resources & References
The conversation we’ve opened in this article is a sensitive one — touching on illness, identity, and injustice. It’s based not only on personal observations and lived experiences, but on a growing body of scientific, regulatory, and policy evidence.
The sources below were carefully selected to support key claims made throughout this piece. They include peer-reviewed research, government documents, public statements from medical bodies, and independent lab results. Some challenge the status quo. Others reveal how little we truly know — especially about those most at risk.
We invite you to explore them not as isolated facts, but as part of a larger pattern.
MoH Aide-Mémoire: Budget 2022 Bowel Screening Proposal
Internal Ministry of Health briefing on a contingency fund to lower screening age for Māori and Pacific peoples. Confirms this was deprioritised in favour of a universal age of 58.
Royal Australasian College of Surgeons: Screening Age Reduction ‘A Step Back’
Press release opposing the government’s decision to lower the screening age universally instead of prioritising at-risk groups like Māori and Pasifika.
IARC GLOBOCAN: New Zealand Fact Sheet – Colorectal Cancer 2022
Official IARC data showing that bowel cancer is the second most common cause of cancer-related death in New Zealand—providing key national context.
RACP: https://www.racp.edu.au/news-and-events/media-releases/govt-move-to-raise-age-of-free-bowel-cancer-screenings-for-m%C4%81ori-and-pacific-people-will-cost-lives-doctors-warn
The Royal Australasian College of Physicians warns that abandoning targeted screening will deepen health inequities and lead to preventable deaths.
University of Auckland: Māori Colorectal Cancer Mortality After Surgery
Reports that Māori patients are more likely to die after colorectal cancer surgery due to systemic barriers in care quality and access.
No More Glyphosate: Glyphosate Detected in Mānuka Honey
Results from Batch 2 of independent lab testing show glyphosate residues in 5 of 7 mānuka honey samples, including major NZ brands.
No More Glyphosate: Glyphosate and Kidney Cancer
Article highlighting new scientific evidence linking glyphosate to enzyme disruption and molecular pathways relevant to kidney carcinogenesis.
EHJ: Global Glyphosate Study — Long-Term Animal Results
Peer-reviewed findings from a major independent study confirming dose-related tumour increases across multiple organs in rodents exposed to glyphosate.
PubMed: Glyphosate Linked to Kidney Tumor Pathways
Research using molecular modeling shows glyphosate directly interacts with kidney enzymes, possibly explaining tumour development mechanisms.
RSC Food & Function: Glyphosate Alters Gut Microbiota
A 2024 study demonstrating that glyphosate and its formulations induce gut dysbiosis, damage gut lining, and alter metabolic function.
PMC: Glyphosate Sensitivity in Human Gut Bacteria
A major review showing that over half of core human gut microbes are likely sensitive to glyphosate’s mode of action, raising concern over microbiome disruption.
GGS Project Overview — Glyphosate Global Study (Video Summary)
Overview of the global glyphosate animal toxicity study, outlining methodology and key findings related to cancer and organ effects.
Why This Section Matters
Too often, articles like this are dismissed for being “anecdotal” or “emotional.” The references listed here make clear that this story is grounded — not just in experience, but in evidence. These aren’t wild claims. They’re well-sourced questions that regulators and public health officials can no longer afford to ignore.
We share them with humility, transparency, and a genuine hope that others — researchers, reporters, workers, health professionals — will take the next steps from here.
This article may ask hard questions, but the resources below offer a place to start answering them.
Image Source & Attribution
We’re grateful to the talented photographers and designers whose work enhances our content. The feature image on this page is by lucidwaters.
