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SupportedFoodLast updated: July 10, 2026

GMO food safety

Major scientific and regulatory bodies worldwide, including WHO, EFSA, and the U.S. National Academies of Sciences, have concluded that currently approved genetically modified foods are as safe to eat as their conventional counterparts. More than 3,000 studies support this conclusion.

Written by Iggy Pomp · Reviewed by Igor Pomper · Last updated July 10, 2026

What we know

Genetically modified organisms (GMOs) approved for food use undergo rigorous, multi-year safety assessments before they are permitted to reach the market. WHO states that GM foods currently available on the international market have passed safety assessments and are unlikely to present risks to human health. EFSA's GMO Panel conducts detailed case-by-case risk assessments for every GM food submitted for authorization in the European Union, covering molecular characterization of the inserted genes, food and feed safety testing, and environmental impact analysis, a process that typically takes several years per application.

A comprehensive 2016 report by the U.S. National Academies of Sciences, Engineering, and Medicine examined more than 900 studies published over more than two decades and concluded there was no substantiated evidence of a difference in risks to human health between currently commercially available genetically engineered crops and their conventionally bred counterparts. Epidemiological data from countries where GM foods have been consumed for close to three decades, including extensive use in the United States, Canada, and several South American countries, shows no association between consumption of approved GM foods and any disease or chronic condition at the population level.

More than 280 independent scientific institutions worldwide recognize the safety of approved GM crops, according to a widely cited review by the Genetic Literacy Project drawing on the earlier compilation by Davison and Ammann. In 2025, EFSA further concluded that new genomic techniques (NGTs) applied to farmed food animals do not pose novel hazards compared to conventional breeding methods, extending the same evidentiary standard used for plant crops to newer applications of the technology.

A long-term feeding study by Snell and colleagues, published in 2012, systematically reviewed twelve long-term and multigenerational animal feeding trials using GM plant diets and found no significant adverse effects across multiple species and generations, addressing a specific concern that shorter studies might miss delayed or cumulative harms. Some researchers maintain that long-term effects in humans remain harder to study directly than in controlled animal populations, that environmental impacts such as the emergence of herbicide-resistant weeds require ongoing monitoring, and that each new GMO trait should continue to be assessed individually rather than assumed safe by category. These are legitimate and active areas of scientific discussion within agricultural science. However, the specific claim that currently approved GMO foods pose unique or hidden health risks to consumers is not supported by the accumulated evidence from regulatory science, and no credible peer-reviewed study has reversed this conclusion since GM crops were first commercialized in the mid-1990s. Regulatory frameworks differ across regions in how they approach approval; the EU applies a precautionary, case-by-case authorization model that has approved a number of GM products for import and food use despite more limited cultivation within the bloc, while the US, Canada, and Brazil have integrated GM crops much more extensively into staple crop production such as soy, corn, and canola. This regulatory divergence reflects differing political and public attitudes toward the technology more than differing scientific conclusions about safety, since the underlying risk assessments draw on much of the same international scientific literature.

Common claims

  • GMO foods cause cancer or other diseasesNot supported by evidence, no epidemiological association has been found
  • Long-term human safety of GMOs has never been studiedPartly true but overstated, epidemiological data from populations consuming GMOs for 30+ years show no specific harms
  • GMOs are banned in Europe because they're proven unsafeMisleading, EU applies a precautionary approach for authorization; many GMOs are approved for import
  • Corporations suppress evidence of GMO harmNot supported, independent institutional reviews consistently confirm safety

Evidence hierarchy

01National Academies: Genetically Engineered Crops, Experiences and Prospects (2016)Review of 900+ studies; found no substantiated evidence of health risks from approved GE crops compared with conventional crops02Snell et al. (2012): Assessment of the health impact of GM plant diets in long-term and multigenerational animal feeding trialsSystematic review of 12 long-term and multigenerational feeding studies; found no significant adverse effects03EFSA GMO Panel, scientific opinions on GM food/feed safetyEFSA conducts case-by-case risk assessments; no approved GMO has been found to pose novel health hazards04WHO: Food safety, Frequently asked questions on genetically modified foodsWHO states GM foods available internationally have passed safety assessments and are unlikely to pose health risks

All sources

Related terms

GMOs cause new food allergiesAspartame causes cancerWater fluoridation safety