You searched for a list of diseases caused by GMO foods because something frightened you: a viral post, a documentary, a relative who swears by organic. So here is the part most articles bury: no disease has been shown to be caused by the genetically modified foods sold today. That is the position of the World Health Organization and of the U.S. National Academies, and I’ll show you what they actually said, where the scary claims came from, and which concerns are still worth your attention.
I’m Dr. Nada, a pharmacist with a certification in Nutrition Science from Zewail International Academy. I’m not a registered dietitian, and I don’t treat patients. An earlier version of this article leaned on animal studies and suggested links between GMOs and cancer, infertility and organ damage that the evidence doesn’t support. I’ve rewritten it so it says what the research says.
The Short Answer
The WHO states that GM foods currently on the international market have passed safety assessments and are not likely to present risks for human health, and that no effects on human health have been shown from people eating them in countries where they are approved. A major 2016 review by the National Academies of Sciences, Engineering, and Medicine reached a similar conclusion, finding no substantiated evidence that foods from GE crops were less safe than foods from non-GE crops.
That doesn’t mean every question is closed. Long-term research is hard, regulators in different countries weigh risk differently, and the herbicides used on some GM crops are a separate and legitimate debate. Keep “GMO” and “herbicide” apart in your head, because the claims below mix them up constantly.
Where the “GMO Diseases” Claims Come From
Most frightening headlines trace back to a handful of sources.
- A rat study that was retracted. In 2012, Gilles-Eric Seralini and colleagues reported tumors in rats fed GM maize and the herbicide Roundup. The journal retracted it in 2014 because the results were inconclusive, citing the small sample size and a rat strain with a high natural tumor rate. The authors republished it elsewhere, and critics were not persuaded. You can read the analysis of the retraction.
- A soybean that never reached the shelf. In 1996, researchers showed that a soybean engineered with a Brazil nut protein could trigger reactions in people allergic to Brazil nuts. That study, in the New England Journal of Medicine, is often retold as proof GMOs cause allergies. In fact, the developer dropped the project, which is exactly what allergen testing is supposed to catch.
- Glyphosate headlines. These are about a weed killer, not a gene. More on this below.
Allergies: What’s Real
The fear is that moving a gene into a food could add a new allergen. It’s a fair question, and it’s why regulators test for it. The WHO notes that transferring genes from commonly allergenic organisms is discouraged unless the protein is shown to be non-allergenic, and that no allergic effects have been found in GM foods currently on the market.
If you have a diagnosed food allergy, the practical advice hasn’t changed: read labels, avoid your trigger, and ask your allergist before changing your diet.
Cancer: GMOs Versus Glyphosate
There is no solid evidence that eating approved GM foods causes cancer. The cancer debate is mostly about glyphosate, the herbicide used on crops engineered to tolerate it.
In 2015, the International Agency for Research on Cancer classified glyphosate as probably carcinogenic to humans (Group 2A), a rating based on hazard rather than on how much risk you face from food residues. Other regulators, including the U.S. EPA, have reviewed the evidence and reached different conclusions about risk. Scientists are still debating why the assessments diverge.
What that means for your plate: if glyphosate residues worry you, buying organic or washing and peeling produce addresses the herbicide. It doesn’t tell you the gene itself is harmful.
Infertility and Organ Damage
The older version of this page cited rat studies on fertility and organ damage without clear sourcing. I couldn’t verify those citations, so I removed them. The best large reviews, including the National Academies report and the WHO, didn’t find these effects in humans. Researchers have studied animals fed GM crops across generations, and the broad conclusion is no consistent harm, though individual studies get argued over and the evidence for any food is imperfect.
What Concerns Are Worth Taking Seriously
- Herbicide residues. Worth following, especially for farm workers and people who eat a lot of heavily sprayed crops.
- Ultra-processed food. Much of the GM corn and soy ends up as syrups, oils and starches in packaged snacks. The problem there is the ultra-processed food, not the gene. My guide to the no processed food diet shows how to cut back, and the hidden sugars checklist helps you spot the big offenders.
- Labeling and choice. Many people simply want to know what they are eating, and that’s a fine reason to shop non-GMO.
- Environmental and farming questions. These are real debates but separate from your personal health risk.
A Practical Non-GMO Shopping Guide
If you’d like to avoid GM ingredients anyway, here’s how. The FDA lists the GM foods available in the U.S. as corn, soybean, cotton, potato, papaya, summer squash, canola, alfalfa, apple, sugar beet and pink pineapple, plus AquAdvantage salmon (see the FDA overview).
| Food | GM version sold in the U.S.? | What to do |
|---|---|---|
| Corn and corn ingredients | Yes | Check cornstarch, corn syrup and corn oil; choose organic or Non-GMO Project Verified |
| Soybeans, soy oil, soy lecithin | Yes | Choose organic or verified tofu, soy milk and soy products |
| Canola oil | Yes | Look for organic or verified, or use olive or avocado oil |
| Sugar | Sugar beets, yes | Cane sugar is not GM; check whether packaging says sugar or cane sugar |
| Papaya, summer squash, some potatoes and apples | Yes, some varieties | Ask or check labels for these specific items |
| Berries, leafy greens, citrus, bananas, tomatoes, avocados | Not on the FDA list | No special label hunting needed |
| Rice, oats, quinoa, lentils, chickpeas, beans | Not on the FDA list | Plain versions are fine |
Two labels help. Foods labeled Non-GMO Project Verified have gone through a third-party program, and certified organic foods exclude GM ingredients under organic rules. Since January 2022, the USDA’s bioengineered food disclosure standard has also required many packaged foods to disclose bioengineered ingredients.
Costs add up with organic. If your budget is tight, an easy compromise is to prioritize the crops above and eat more plain vegetables from my list of the lowest-calorie vegetables. If you’re wondering whether corn itself is a problem for digestion, I covered that in is corn bad for your gut.
What I’d Suggest If GMOs Still Worry You
If this topic makes you anxious, don’t aim for a perfect diet. Start with the change that helps whatever your view on GMOs: eat more foods that don’t have an ingredient list at all, such as vegetables, fruit, beans, eggs and fish. Next, read the labels on the products you buy most often, like cooking oil, breakfast cereal and snack bars, and decide whether you want to swap any of them. If your budget allows, choose organic or Non-GMO Project Verified versions of the crops on the FDA list that you eat every day. Finally, if you have a health condition or an allergy, or you’re pregnant, ask your doctor or an allergist what matters for you rather than relying on a headline. A useful rule of thumb: be suspicious of any article that gives you a long list of diseases and no sources, including the earlier version of this one.
Frequently Asked Questions
Do GMOs cause cancer?
No link has been established between eating approved GM foods and cancer in people. Concerns about cancer focus on the herbicide glyphosate, which IARC classifies as probably carcinogenic, while other regulators judge the risk from food residues to be low.
Can GMO foods cause allergies?
In principle a gene transfer could add an allergen, which is why testing exists. The WHO reports no allergic effects from GM foods currently on the market.
Are GMOs linked to infertility?
Not in humans, based on the major reviews. Claims from individual animal studies haven’t held up to broad scrutiny.
Is non-GMO food healthier?
Not automatically. A non-GMO cookie is still a cookie. The health gain comes from eating more whole, minimally processed foods.
Is organic food GMO-free?
Certified organic food excludes GM ingredients under organic standards, though trace contamination can occur.
The Bottom Line
The science doesn’t back a list of diseases caused by GMO foods. It does support reading labels, eating less ultra-processed food and asking fair questions about herbicides. If you have allergies, a medical condition or are pregnant and want to change your diet, talk to your doctor first.
Sources
- WHO. Food, genetically modified.
- National Academies of Sciences, Engineering, and Medicine. Genetically Engineered Crops: Experiences and Prospects, 2016.
- FDA. GMO crops, animal food, and beyond.
- IARC. Glyphosate monograph Q&A.
- Nordlee JA et al. Identification of a Brazil-nut allergen in transgenic soybeans. New England Journal of Medicine, 1996.
- USDA AMS. Bioengineered food disclosure.
Last reviewed: October 2026.
Written by Dr. Nada, a pharmacist certified in Nutrition Science (Zewail International Academy). This article is educational and not a substitute for personal medical advice.
