Reprinted with permission from Sayer Ji, Founder of GreenMedInfo.
A novel class of genetically engineered food has quietly colonized the American diet since 2017. It doesn’t make a poison. It switches off genes. And there is no label telling you it’s there.
Dinner Disrupted
Picture a family eating dinner in the American Midwest. The kids are having corn chips and juice. Dad’s eating a pork chop. Mom reaches for the salsa — corn-based, like nearly everything on the table. It’s an ordinary evening in the most ordinary country in the world.
Now consider what might be happening at the molecular level inside that corn.
Embedded in the genome of the corn plants that grew those chips — the same corn that makes the high-fructose syrup in that juice, the same corn silage that fed that pig — is a genetic sequence encoding a molecule called double-stranded RNA, or dsRNA. Think of dsRNA as a search-and-destroy code for genes: a precisely designed molecular message that, when read by a cell’s machinery, identifies a target gene and shuts it down. The target, in this case, is a gene in the western corn rootworm — a devastating agricultural pest. The technology is called RNA interference, or RNAi. The corn is called SmartStax PRO, and it was approved by the EPA in June 2017.
Since that near-silent approval, RNAi crops have expanded to somewhere between 20 and 30 million acres of American farmland. A sprayable version — a gene-silencing aerosol applied directly to potato fields — has been commercially available since 2024. A second sprayable product, this one fed directly to honeybee colonies to kill varroa mites, received federal registration in September 2025. RNA-based fungicides are now before regulators in the US, the EU, and Brazil. An RNA herbicide that silences genes in weeds rather than insects is moving through development.
The family at the dinner table knows none of this. There is no label. There is no mandatory disclosure. There is, to all appearances, just dinner.
This is the story of how we got here, what the science actually says, and why the window to demand a different answer is closing faster than anyone in Washington will admit.
What RNAi Is — and Why It’s Different From Every GMO Before It
To understand why this moment matters, you need to understand what makes RNAi agriculture genuinely unprecedented.
Every GMO that came before it — herbicide-tolerant soybeans, Bt corn, Golden Rice — worked by adding or deleting a protein. The engineered gene produced a new protein, or it knocked out a protein the plant already made. Proteins are the workhorses of biology, and their effects, while sometimes complex, can in principle be tested with standard toxicological tools: feed it to rats, measure the outcomes.
RNAi works at an entirely different level of biology. It doesn’t produce a protein at all. It produces RNA — specifically, double-stranded RNA — which acts not as a building block but as an instruction. RNA is the software running on the DNA hardware of a cell. And double-stranded RNA, in particular, is something mammalian biology has evolved to treat with extreme caution.
Here’s why. Long before the first drug or pesticide was ever invented, viruses were invading cells and replicating using double-stranded RNA as part of their life cycle. Mammalian immune systems evolved a hair-trigger response to any long, perfectly duplexed RNA in the cellular environment, treating it as a viral alarm signal — what immunologists call a PAMP, or Pathogen-Associated Molecular Pattern. When the immune system detects a PAMP, it doesn’t pause to sequence it or identify its source. It responds: shutting down protein synthesis, degrading cellular RNA, triggering interferon, and, in severe or sustained cases, initiating cell death.
The DvSnf7 dsRNA in SmartStax PRO corn — the active genetic payload in the world’s first commercial RNAi crop — is a 240 base-pair hairpin. The threshold for triggering the mammalian interferon response is 30 base pairs. The threshold for maximal activation of PKR, the immune kinase that halts all protein translation in an affected cell, is 85 base pairs. SmartStax PRO’s payload clears both thresholds by a wide margin.
This is not a theoretical concern invented by critics. It is established molecular biology, documented in peer-reviewed literature, and identified in the canonical risk analysis of RNAi crops by independent scientists Jonathan Latham and Allison Wilson of the Bioscience Resource Project. Their framework — which I first reported on in my 2015 GreenMedInfo article on the EPA’s silent approval — identified three distinct mechanisms by which RNAi crops could harm non-target organisms, including humans. Nearly a decade later, none of the three mechanisms has been adequately addressed by regulators.
And meanwhile, the food supply has been transformed.
The Gene That Never Asked Permission
The story of how RNAi corn entered American agriculture without public knowledge begins with a regulatory decision in June 2017 that Bill Freese of the Center for Food Safety, reporting to The Atlantic, called a masterpiece of bureaucratic invisibility.
The EPA offered just 15 days of public comment on SmartStax PRO — compared to the standard 60 days for significant regulatory actions. The agency did not post the approval to the Federal Register, the standard mechanism by which the public and Congress are notified of major regulatory decisions. The technology landed in American cornfields with the quiet authority of a memo circulated among insiders — which is essentially what it was.
SmartStax PRO was not a simple product. As I documented in that 2015 article, the approved stack contained six separate modes of action stacked into a single corn variety: the DvSnf7 dsRNA RNAi payload, three separate Bt proteins for rootworm and above-ground pest control, glyphosate tolerance, and glufosinate tolerance. This complexity was not incidental. Embedding the RNAi trait within an already-complex toxicological cocktail made it impossible to isolate RNAi-specific effects in any subsequent field monitoring. If something went wrong in the populations eating this corn, identifying dsRNA as the cause would require a level of molecular epidemiology that the United States has never performed for any agricultural biotechnology.
The EPA’s own Scientific Advisory Panel had flagged “ongoing areas of uncertainty” in its 2016 meeting minutes — concerns that dated back to a 2014 SAP meeting and had not been resolved. The approval went forward anyway.
No new RNAi-specific SAP meeting appears on the EPA’s advisory panel list for 2025 or 2026. The scientific review has not kept pace with the commercial expansion.
Since 2017, Bayer has steadily expanded SmartStax PRO acreage. By the 2024 growing season, Bayer’s seed lineup featured 25 new DeKalb hybrids carrying SmartStax PRO or the related VT4PRO RNAi technology — a second Bayer trait launched commercially in Eastern Canada in 2025. Corteva launched its own competing RNAi corn product, Vorceed Enlist, in 2023, targeting the same DvSnf7 gene sequence in corn rootworm. Both companies’ RNAi acres are additive. The total US footprint of RNAi corn in 2025 is conservatively estimated at 20 to 30 million acres — roughly 20 to 30 percent of the total US corn crop.
That corn is the genomic backbone of approximately 75 percent of processed foods sold in American supermarkets.
Food as Information: What Science Has Quietly Established
To grasp what is truly at stake, you have to understand a revolution in biology that has been unfolding in the scientific literature for the past two decades — a revolution that most people, including most physicians, have not yet absorbed.
The human genome, as I explored in “Genetic Dark Matter and the Return of the Goddess”, is not primarily a protein-coding machine. Only about 1.5 percent of human DNA encodes proteins. The remaining 98.5 percent — dismissed for decades as “junk DNA” — produces a vast landscape of regulatory RNA molecules, including microRNAs, that govern the expression of approximately one-third of the entire protein-coding genome. The Human Genome Project’s revelation that humans possess only around 23,000 genes — fewer than a grain of rice — was a paradigm-shattering moment: complexity lives not in gene count but in the regulatory RNA environment.
This regulatory landscape is not hermetically sealed inside the human body. Plants also produce microRNAs. And as a landmark 2012 study in Cell Research by Chen-Yu Zhang and colleagues found, plant microRNAs — specifically, a rice microRNA called miR168a — were detectable in the serum of Chinese subjects who ate rice-rich diets. More than that: miR168a appeared to suppress the expression of a liver gene called LDLRAP1, which governs LDL cholesterol clearance. Food wasn’t just fueling the body. Food was talking to the genome.
As I documented in “The Dark and Light Side of Food As Information”, this was not an isolated finding. Plant miR2910 — conserved across fruits and vegetables humans have eaten for hundreds of thousands of years — appears in high relative abundance across 410 human plasma small RNA sequencing datasets. It shares structural features with human microRNAs and is predicted to modulate the JAK-STAT signaling pathway through its target gene SPRY4, a pathway governing immunity, cell differentiation, proliferation, and the suppression of cancer. The emerging picture is one of cross-kingdom nutritional signaling: plant-derived microRNAs may constitute an evolutionarily ancient information channel through which the human genome receives calibrating molecular signals from its food environment.
A 2025 review in Frontiers in Nutrition confirmed this evidence base, describing how plant miRNAs can “survive digestion, enter the mammalian circulation, and modulate host gene expression to influence glycolipid homeostasis,” and identified SIDT1 — a transmembrane protein — as a candidate active uptake mechanism. The science has moved beyond passive diffusion.
Is this universally accepted? No. A rigorous September 2025 systematic review in Advances in Nutrition by Tambaro and colleagues — the most careful assessment to date — found methodological heterogeneity that explains much of the positive signal, and concluded that “no direct molecular evidence currently demonstrates that plant xenomiRs bind to mammalian silencing machinery.” A large-scale analysis of 824 human datasets found xenomiRs — foreign plant microRNAs in human blood — were “likely artifacts” from technical contamination. A 2024 review in ExRNA, however, found “increasing evidence suggests these dietary miRNAs are not only capable of being absorbed by consumers such as humans, but also appear to be extensively involved in various physiological activities.”
Both sides agree on the most important point: the question is genuinely open.
And that is precisely why what is being inserted into this signaling system — without consent, without labels, without long-term study — matters so much.
The Dark Side: Novel Instructions in an Ancient System
The light side of the food-as-information story is this: the microRNAs in the plants you eat may be part of an evolutionary conversation between species, one that has been calibrating human gene expression for as long as we have been eating plants. The diet of your ancestors was, in this sense, a molecular curriculum.
The dark side is this: we are now inserting novel molecular instructions — dsRNA sequences derived from insect genes, never part of any plant’s evolutionary repertoire, never part of any human dietary history — into those same food plants. And we are doing it without telling anyone.
The DvSnf7 dsRNA in SmartStax PRO corn is a 240 base-pair hairpin derived from the Snf7 gene of the western corn rootworm (Diabrotica virgifera virgifera). It is expressed constitutively — throughout the growing season, in roots, leaves, and pollen — in corn plants that now occupy tens of millions of American acres. It is not a sequence that appears anywhere in the evolutionary dietary history of Homo sapiens. It is a novel molecular instruction, inserted into the most prevalent food crop in the American diet, without the knowledge or consent of the people eating it.
The Calantha dsRNA (ledprona) — targeting the PSMB5 gene in the Colorado potato beetle — is a 490 base-pair sequence sprayed onto potato plants in the field. Potatoes are consumed with minimal processing: baked, boiled, fried. Unlike corn, which undergoes extensive industrial transformation into syrups and starches and chips, the potato on your plate is close to the field. No published study has examined whether ledprona residues survive in commercially cooked potatoes. GreenLight Biosciences secured Calantha’s final EPA registration in January 2024 and the product was commercially available to potato growers by spring of that year.
Monsanto’s own 2008 research — cited in my 2024 GreenMedInfo investigation — found that endogenous corn small RNAs already match approximately 450 to 2,300 unique RNA transcripts in rat, mouse, and human genomes. Industry interpreted this as evidence that mammals safely consume plant RNA. Critics, including Latham and Wilson, read it differently: it demonstrates that plant small RNAs are already complementary to mammalian genes, meaning that deliberately engineering plants to over-express specific dsRNA sequences of defined length and complementarity doesn’t introduce a new risk category from scratch. It adds an intentional layer of cross-species gene-targeting onto an already present background of natural cross-kingdom RNA signaling — with no safety testing to characterize the interaction.
This is the question science has not answered. This is the experiment now running on 330 million Americans.
Read the rest of this incredibly informative article here.