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The claim

“GMOs cause cancer.”

False
Evidence confidence Strong

Strong confidence because the National Academies review found no substantiated evidence of greater risk from marketed GE foods, a decade-scale review found no significant hazard, and a two-year rat feeding study of a GM maize found no treatment-related adverse effects. Population comparisons cannot exclude every small effect, and herbicide questions are a separate topic.

The facts

Eating assessed GMO foods has not been shown to cause cancer. Studies of the foods do not support the claim that changing a crop's genes makes it cancer-causing. Studies of herbicide exposure address a separate question.

The bigger picture

A two-year rat experiment with a specific GMO maize found no related adverse effects. That supports the safety of the tested food, not a zero-risk guarantee for every food or farm chemical.

Exposure Matters

An animal drinking a herbicide formulation and a person eating a food ingredient receive different substances and doses. Those results cannot be treated as interchangeable.

Who should be careful?

Safety note: Follow food recalls and ordinary food-safety precautions regardless of GMO status.

What this means for you

There is no research-based reason to remove assessed GMO foods specifically to prevent cancer.

Your next step

Evaluate the food itself rather than treating GMO as a cancer warning.

Sources
Last reviewed 2026-10-06 Suggest a correction →

Similar claims on GMO foods: safety, cancer, allergies, DNA and the non-GMO label

Bottom line on GMO foods: safety, cancer, allergies, DNA and the non-GMO label

Judge the food, not the label. GMO status alone is not a health signal in either direction.