Some people feel the effects of eating GM crops on human health have not…

The idea

GM crops contain genes transferred from other organisms, so their DNA and proteins differ from those of conventional crops. Some people argue that the long-term effects of eating these foods on human health are not fully known. Possible concerns include new proteins that might cause allergic reactions, changes in nutritional content, or unexpected effects that only appear after many years. Because GM foods have been eaten widely for a relatively short time, some people say there is not enough evidence about lifelong consumption. Others point out that GM foods are tested and regulated before sale, and that no clear harm has been proven. In an exam, present this as a concern held by some people, not as a proven fact. A balanced answer explains the concern and may note the counter-argument that testing and monitoring are carried out.

What earns the marks

• GM crops contain genes from other organisms, so they may produce proteins not normally found in that food.
• Some people think the long-term effects of eating GM foods on human health have not been fully investigated.
• Possible concerns include allergic reactions to new proteins or changes in nutritional content.
• The concern is about uncertainty over many years of consumption, not a proven harmful effect.
• A balanced answer may note that GM foods are tested and regulated, and that no clear harm has been proven.
• Answers should distinguish between a public concern and a scientific conclusion.

Common mistakes and how to put them right

• Stating that GM foods are proven to be harmful.

  Put it right: The specification refers to a concern that effects have not been fully explored, so use cautious wording.

• Confusing health concerns with environmental concerns such as effects on insects.

  Put it right: Keep the focus on eating GM crops.

• Claiming that all GM foods cause allergies.

  Put it right: The concern is that new proteins might cause reactions in some people, not that they always do.

Exam tips

• Use phrases such as ‘some people feel’ or ‘there is concern that’ to show it is a viewpoint, not a fact.
• Give a specific possible effect, such as an allergic reaction to a new protein, rather than saying ‘it is bad for you’.
• Add a balancing sentence about testing or regulation to show you can evaluate the concern.