What environmental and health concerns have been raised about genetically modified crops?

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A step-by-step diagram shows donor DNA and vector DNA cut with restriction enzymes to create overhangs, mixed and sealed with ligase to form recombinant DNA, which is introduced into bacterial cells. The recombinant DNA replicates as the cells divide, producing clones. — biotechnology Steps involved in the engineering of a recombinant DNA molecule.

Concerns regarding genetically modified (GM) crops center on potential risks to human health and the environment. While many scientific panels, including the U.S. Food and Drug Administration, have concluded that GM foods are safe for consumption, critics and researchers have identified several areas of concern.12

Health Concerns

The primary health concerns involve:
* Allergenicity and Toxicity: Genetic modification may inadvertently introduce new allergens or increase existing ones in host plants. There is also concern that the process could disrupt a plant's genetic integrity, potentially activating toxins or altering metabolic toxin levels.3
* Genetic Hazards: Some studies suggest that the insertion of foreign genes could lead to unintended health consequences, such as the allergic reactions reported in consumers of StarLink corn.3

Environmental Concerns

Environmental risks are largely linked to agricultural practices and ecological impact:
* Chemical Use and Resistance: Many GM crops are engineered for herbicide resistance, leading to increased use of chemicals like glyphosate. This has contributed to the evolution of herbicide-resistant "super-weeds" and insecticide-resistant "superbugs," such as the cotton bollworm.41
* Biodiversity Loss: The use of herbicides on resistant crops can reduce weed diversity, negatively impacting habitats for pollinators like the monarch butterfly and other beneficial insects.45
* Gene Flow: There is a risk that engineered genes may spread to native flora, potentially altering wild populations.15