Fact Sheet: Pros vs Cons

What counts as genetically modified?

Genetic modification means changing an organism's DNA in a laboratory rather than through conventional breeding. Traditional plant breeding crosses plants with desirable traits and selects offspring over many generations, sometimes taking decades to develop a new variety.

Genetic engineering speeds this up by inserting specific genes directly into a plant's DNA. Sometimes those genes come from unrelated species. Bt maize, for example, contains a gene from a soil bacterium that makes the plant toxic to certain insects. This transfer of DNA between species is called transgenic modification.

Gene editing, such as CRISPR, takes a different approach. Rather than adding foreign DNA, these tools make precise changes to an organism's existing genes: tweaking what is already there rather than adding something from elsewhere. UK law now treats these two approaches differently.

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Arguments for and against

Supporters point to several potential advantages. Crops engineered to resist pests or tolerate drought may produce more food per hectare. Some GM crops fend off insects without chemical sprays, meaning farmers could apply fewer pesticides. The picture varies by crop and region, and some studies suggest pesticide use has not fallen as much as hoped.

Drought-tolerant or flood-resistant varieties could help farmers cope with unpredictable weather. Golden rice was engineered to contain beta-carotene to address vitamin A deficiency in populations relying heavily on rice. It has faced regulatory delays and is not widely grown, but it shows what the technology could do. Some GM foods ripen more slowly or resist bruising, reducing waste between farm and shop.

Proponents argue farmers may save money over time through lower input costs and better harvests, though this depends on local conditions. Critics counter that seed prices have risen substantially since GM varieties became dominant in some markets, and patents can prevent farmers from saving and replanting their own seed.

On health, GM foods approved for sale have been through safety assessments, and major scientific bodies generally consider them safe to eat. Some people worry about effects that might only show up after many years. There is also a theoretical risk that foods containing genes from known allergens could trigger reactions, though safety assessments are supposed to catch this.

Environmental risks are harder to settle. Modified genes could spread if GM crops breed with wild relatives or conventional crops nearby. Crops engineered to kill particular pests might also harm beneficial insects. Large-scale planting of a small number of GM varieties could reduce genetic diversity, making food systems more vulnerable to new diseases. A handful of large companies dominate the GM seed market, which critics say gives them too much power over the food supply.

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Where the UK stands

While in the EU, the UK followed strict European rules that effectively banned most GM crop cultivation and required clear labelling. Since Brexit, England has started to chart its own course.

The Genetic Technology (Precision Breeding) Act 2023 allows gene-edited crops and animals to be developed and sold in England with a simpler approval process than traditional GM organisms face. Post-market monitoring still applies. The Act covers only gene editing, where no DNA from other species is introduced. Full transgenic modification still faces tighter controls.

Scotland and Wales retain stricter rules. Northern Ireland's position is complicated by the Windsor Framework, which keeps it aligned with EU food regulations restricting GMO cultivation.

The Food Standards Agency oversees safety assessments for GM and gene-edited foods in England, Wales, and Northern Ireland. Food Standards Scotland handles this in Scotland. GM food sold in the UK must be labelled, though there are some exceptions. At the time of writing, there is no requirement to label gene-edited foods that could have been produced through traditional breeding, but this may change.

Practical points for shoppers

If you want to avoid GM ingredients, labelling rules require foods containing them to say so on the packaging. Look for wording like "produced from genetically modified soya" in the ingredients list. Meat, milk, and eggs from animals fed GM feed do not have to be labelled.

Organic standards prohibit GM ingredients and GM animal feed, so certified organic products should be GM-free. For processed foods, GM soya and maize are the most common sources of GM ingredients, often appearing as soya lecithin, maize starch, or vegetable oil.

As gene-edited foods start to appear, the labelling situation may become less clear. Current proposals would not require labels for gene-edited products resembling what could occur naturally. This is an area to watch.

Whether to buy or avoid GM foods is a personal decision. The science is contested in places, the regulations are changing, and people weigh the concerns differently. What matters is having enough information to make the choice that feels right to you.

The Next Step

Now that you have read through the advice above, you might want to put it into practice. Our GM Food Identifier lets you check whether common foods and ingredients are likely to contain genetically modified content. Try it now →