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Most people think of pesticide exposure as something that happens outdoors — on lawns, farms, golf courses. But glyphosate, the active ingredient in Roundup, has quietly become one of the most pervasive chemicals in the modern food supply. It's in your oatmeal. It's in your granola bars. It's in bread, pasta, chickpeas, and breakfast cereal. And in most cases, nobody put it there intentionally.
In 2018, the Environmental Working Group (EWG) tested 45 oat-based products purchased from grocery stores across the U.S. 43 of 45 came back positive for glyphosate. Many exceeded EWG's health benchmark of 160 parts per billion (ppb) — the level the group considers safe for children consuming the product daily. Several came in at five to ten times that threshold.
This article breaks down which products tested highest, how glyphosate gets into food in the first place, what the science says about risk, and how to reduce exposure without overhauling your entire diet.
Oat Products: Who Tested Highest
The following data comes from the EWG's 2018 Children's Health Initiative study, which tested 45 conventional and organic oat-based products using laboratory analysis. Results are in parts per billion (ppb). EWG's health benchmark for children is 160 ppb.
| Product | Glyphosate (ppb) | vs. Benchmark |
|---|---|---|
| Quaker Old Fashioned Oats | 1,028 | 6× over limit |
| Quaker Simply Granola — Oats, Honey & Almonds | 921 | 5.7× over limit |
| Nature Valley Crunchy Granola Bars — Oats 'n Honey | 566 | 3.5× over limit |
| Nature Valley Granola Protein — Oats 'n Honey | 521 | 3.3× over limit |
| General Mills Cheerios (original) | 530 | 3.3× over limit |
| Back to Nature Classic Granola | 491 | 3.1× over limit |
| Kind Oats & Honey Granola Clusters | 452 | 2.8× over limit |
| Kellogg's Cracklin' Oat Bran | 455 | 2.8× over limit |
| Bob's Red Mill Steel Cut Oats (conventional) | 302 | 1.9× over limit |
| 365 Organic Old-Fashioned Rolled Oats | 10 | Well below limit |
| Bob's Red Mill Organic Rolled Oats | 6 | Well below limit |
The pattern is consistent: conventional oat products came in high, organic came in low. Of the products that tested below EWG's benchmark, almost all were certified organic. The two exceptions were conventional products with very low residue levels — below 10 ppb — suggesting some variation within conventional farming as well.
Beyond Oats — Other Foods That Commonly Test Positive
Oats get the most attention because they're heavily desiccated before harvest. But glyphosate has been detected across a wide range of everyday foods.
Wheat and Bread Products
Wheat is one of the most commonly desiccated crops in North America. A 2016 study published in the Journal of Environmental & Analytical Toxicology found glyphosate residues in a range of bread and pasta products. The FDA's own pesticide residue monitoring program has confirmed glyphosate is routinely present in wheat-based foods at levels similar to oats.
Chickpeas and Legumes
Lentils, chickpeas, and dried beans are increasingly desiccated with glyphosate before harvest. Testing by the Canadian Food Inspection Agency found glyphosate in a significant proportion of dried pulse samples — with chickpeas and lentils showing some of the highest detection rates of any food category tested.
Breakfast Cereals
The EWG's follow-up 2019 study tested 21 oat-based children's cereals and found glyphosate in all 21. Honey Nut Cheerios Medley Crunch came in at 833 ppb — the highest of any single product tested across both studies. Several products marketed to children specifically exceeded the benchmark by wide margins.
Honey
A study published in the journal Science found glyphosate in 41 of 69 honey samples tested from North American grocery stores, with concentrations up to 123 ppb. Bees forage on treated crops and can bring residues back to the hive through nectar and pollen.
How Glyphosate Gets Into Food
Pre-Harvest Desiccation
The primary route into food is a farming practice called pre-harvest desiccation — spraying glyphosate directly onto crops 1–2 weeks before harvest. This isn't weed control. The goal is to dry out the crop uniformly, enabling earlier harvesting and more predictable grain moisture content.
The practice originated in Scotland in the 1980s and is now standard across the U.S., Canada, and Northern Europe for oats, wheat, barley, and legumes. Because glyphosate is applied directly to the edible part of the plant at full maturity, residue levels are far higher than with pre-season applications. Unlike most pesticide residues, glyphosate applied to grain doesn't wash off. It's bound to the grain itself.
If you've read our article on glyphosate in beer and wine, this same mechanism explains why beer tests so high — the malted barley used in brewing comes from the same desiccated grain supply.
Soil Persistence
Glyphosate binds tightly to soil particles and can persist for months to years depending on soil type, temperature, and microbial activity. Crops planted in previously treated fields can absorb residue through root uptake — one reason why even non-desiccated crops sometimes show measurable glyphosate levels.
Irrigation Water
Studies in agricultural regions have detected glyphosate in surface water and irrigation sources. Crops irrigated with treated water can absorb trace amounts independent of direct application.
What Does This Mean for Your Health?
The honest answer is: researchers disagree, and the uncertainty is real.
The Regulatory Split
The EPA classifies glyphosate as "not likely to be carcinogenic to humans" at typical dietary exposure levels and sets an acceptable daily intake of 2 mg/kg body weight per day — a threshold far above what food consumption delivers. Health Canada takes a similar position. The European Food Safety Authority agrees glyphosate is unlikely to be genotoxic at relevant exposure levels.
But the International Agency for Research on Cancer (IARC) classified glyphosate as "probably carcinogenic to humans" (Group 2A) in 2015 — the same category as red meat and working as a hairdresser. This classification is based on limited human evidence and sufficient animal evidence, and it's never been withdrawn.
The Cumulative Exposure Problem
Regulatory limits are typically set for individual foods in isolation. The concern that independent researchers raise isn't acute toxicity from a single bowl of oatmeal — it's the cumulative daily load from eating oats for breakfast, wheat-based bread at lunch, chickpeas at dinner, and drinking beer in the evening, every day, for years.
No regulatory framework currently models glyphosate exposure across an entire diet simultaneously. The EWG's 160 ppb benchmark attempts to account for this — it's set at a level where daily consumption of a single serving of that food, alone, would fall below California's No Significant Risk Level. It doesn't account for glyphosate from all the other foods consumed that day.
How to Reduce Your Exposure
- Switch to certified organic oats. This is the single highest-impact swap. Organic oats consistently test at 5–10 ppb vs. 500–1,000 ppb for conventional. The price difference is typically $2–4 per bag.
- Choose organic granola and cereal. Conventional granola bars and cereals are among the highest-testing products in the EWG study. Organic versions of the same products test dramatically lower.
- Buy organic lentils and chickpeas. Pre-harvest desiccation is widespread in legume farming. Organic certified pulses are a straightforward swap, particularly for hummus made at home.
- Choose sourdough or organic bread. Sourdough made from organic wheat, or organic whole grain loaves, reduces wheat-sourced glyphosate exposure significantly.
- Vary your grains. Rice, corn, and quinoa are less commonly desiccated than oats or wheat. Rotating grains reduces reliance on any single high-residue source.
- For beer, choose organic or craft. As covered in our glyphosate in beer and wine article, organic beers consistently test near zero. Mass-market lagers and ales test highest.
Safer Swaps We Recommend
These are the swaps worth making. Affiliate links help support Canary — at no extra cost to you.
Sources
- EWG — Glyphosate in Oat-Based Foods (2018)
- EWG — Glyphosate in Children's Cereals (2019 Follow-Up)
- IARC — Glyphosate Monograph Classification (2015)
- Science — Glyphosate in Honey Samples (2017)
- Canadian Food Inspection Agency — Glyphosate in Food (2017)
- EWG — How We Set the Glyphosate Health Benchmark