Setting the record straight: 20 common questions about GMOs and modern farming

Yes. In 2016, the National Academies of Sciences reviewed more than 900 studies and found no substantiated evidence of a difference in health risks between GE crops and conventionally bred crops.

The World Health Organization reaches the same conclusion, finding that GM foods available internationally have passed safety assessments and are not likely to present health risks. The FDA agrees that GMO foods are as safe as the foods we currently eat.

The agreement is real and remarkably strong. A Pew Research/AAAS survey found that 88% of scientists consider GM foods safe to eat — a level that equals the scientific consensus on human-caused climate change.

Supporting organizations include the National Academies, the AAAS, the World Health Organization, the American Medical Association, and the European Food Safety Authority.

No credible evidence links GMO consumption to cancer. The American Cancer Society has stated there is no evidence connecting GMO food intake to increased cancer risk, and no evidence that eating GMOs alters your DNA.

A National Academies analysis found that U.S. cancer-rate trends mirror those in Europe and the UK, where far fewer GMO foods are consumed — meaning cancer rates are simply not connected with eating GMOs.

The single most-cited study claiming a GMO–cancer link was widely debunked for using tumor-prone rats, a flawed research design, and statistically invalid methods.

No. No GMO food on the market has been shown to trigger a new allergy. Developers specifically test for allergenicity before any GE crop is approved, and transferring genes from common allergens is strongly discouraged unless the resulting protein is demonstrated to be non-allergenic.

The FDA offers a useful example: GMO soy is no more allergenic than conventional soy. If you’re not allergic to ordinary soy, you won’t be allergic to GMO soy.

GE crops have been grown and eaten commercially since the mid-1990s — roughly three decades — across billions of acres and billions of meals. The 2016 National Academies review specifically examined long-term and chronic-health data and reported that available epidemiological data show no associations between any disease or chronic conditions and the consumption of GE foods.

In Hawaiʻi specifically, the Rainbow papaya has been grown and consumed since 1998 with no observed impact on human safety or the environment.

The 2016 National Academies report noted that new technologies are blurring the once-clear distinctions between genetic engineering and conventional breeding. All plant breeding — cross-pollination, radiation-induced mutation, or genetic engineering — changes a plant’s DNA.

The Academies recommend evaluating crops based on their actual traits and characteristics, not the process used to create them. It’s the product, not the process, that matters for safety.

The Rainbow papaya is one of the clearest real-world examples of genetic engineering saving an entire agricultural industry — and it happened right here. By the 1990s, papaya ringspot virus (PRSV) was devastating production in the Puna district of Hawaiʻi Island.

The virus, spread by aphids, stunted trees and ruined fruit — and the industry was on the verge of extinction with no conventional cure available.

No. The Rainbow papaya was developed by public-sector scientists, not a multinational company. Plant pathologist Dr. Dennis Gonsalves — who grew up in the region most affected by the virus — led a team from Cornell University and the University of Hawaii.

Dramatically. Field trials showed a stark contrast:

Within four years, the genetic improvement halted the industry’s decline and returned production to near pre-virus levels. Today the Rainbow remains the dominant papaya cultivar grown in Hawaiʻi.

In practice, the opposite occurred. Large Rainbow plantings created an effective barrier that actually allowed non-engineered and organic papaya to be grown again in Puna, where isolating clean fields from the virus had previously been virtually impossible.

Dr. Gonsalves describes the result as a kind of “herd immunity.” On the cross-pollination concern: technology licenses were transferred to Hawaiʻi’s papaya industry organizations, so organic growers whose crops cross with Rainbow varieties face no legal liability.

The evidence does not support that claim. The 2016 National Academies review did not find conclusive cause-and-effect evidence of environmental problems from GE crops. In fact, it found that growing insect-resistant or herbicide-resistant crops did not reduce the overall diversity of plant and insect life on farms — and sometimes insect-resistant crops resulted in increased insect diversity.

Herbicide-tolerant GE crops accelerated farmer adoption of no-till and reduced-tillage practices by reducing the need to plow for weed control. When farmers plant directly into undisturbed soil, the benefits compound: increased soil organic matter, better water retention, and soil erosion reduction of more than 80%.

Yes. By reducing the need for fuel-intensive plowing, no-till farming cuts fuel use by an estimated 50–80%.

That’s equivalent to taking more than one million cars off the road. Undisturbed soil also stores more carbon, helping farms become part of the climate solution.

Bt stands for Bacillus thuringiensis, a naturally occurring soil bacterium that produces a protein toxic to specific insect pests but harmless to people, livestock, and beneficial insects. Bt has been used as a sprayed insecticide for over 50 years — including in organic farming, where it is one of the few approved pesticides.

With genetic engineering, scientists incorporate the Bt gene directly into the plant, so the crop is defended around the clock without repeated spraying.

Yes, substantially. The USDA reported that Bt crops eliminated 8.2 million pounds of pesticide active ingredients in a single year (1998), and Bt cotton cut pesticide use by 60–70% in China and Argentina.

The EPA confirms that Bt crops have provided substantial human health, environmental, and economic benefits, allowing growers to use less chemical insecticide while improving yields. The 2016 National Academies report also noted evidence that insect-resistant crops have reduced insecticide poisonings.

Resistance is a genuine agronomic challenge — but it applies to all pest-control methods, including organic and conventional sprays, and it is actively managed. The EPA requires every Bt crop to follow an Insect Resistance Management plan, most notably “refuge” plantings of non-Bt crops that maintain a population of susceptible insects to dilute any resistance genes.

The EPA reports that this refuge strategy has largely been successful in delaying insect resistance, and newer “pyramided” crops that stack multiple Bt proteins are more durable still.

The Rainbow papaya is the clearest local counterexample — it rescued roughly 200 small Hawaiʻi papaya farmers, with seeds distributed to them for free.

Globally, studies of Bt cotton in India and Pakistan — sectors dominated by smallholders farming less than five hectares — found that these farmers gained higher incomes, lower exposure to pesticide health hazards, and measurable contributions to poverty reduction and rural development.

The opposite is true. In the United States, three federal agencies — the FDA, EPA, and USDA — share oversight to ensure GMOs are safe for human, plant, and animal health. The AAAS notes that GM crops are the most extensively tested crops ever added to our food supply.

The Rainbow papaya, for instance, underwent full review by USDA-APHIS, the EPA, and the FDA before its 1998 approval.

No. The USDA is explicit: the Bioengineered (BE) disclosure is a marketing label that does not convey any information about the health, safety, or environmental attributes of bioengineered food compared to non-bioengineered counterparts. The label simply indicates how a food was produced — not that it has changed or become less safe.

After reviewing the health evidence, the 2016 National Academies committee concluded that mandatory labeling is not justified to protect public health.

Local regulatory debates are legitimate and important — but they should rest on evidence, not fear. Hawaiʻi’s own experience offers a cautionary lesson: when county-level restrictions were proposed, papaya farmers had to fight to have the Rainbow specifically exempted, because a broad ban would have undermined the very innovation that saved their livelihoods.

The world’s leading scientific authorities have found no substantiated human-health risk and no conclusive environmental harm from GE crops on the market today. The Academies recommend a science-based, trait-focused approach to regulation — evaluating any new crop on its actual characteristics and potential to cause harm.