Finn: But opponents of GM food - people who argue against it - say we don't know enough about its effect on the environment.
Rob: And then there are the fears about who controls what's grown.
Finn: Yes, but despite this, GM food has become an important part of food production. Crops like sweetcorn, rape plants, wheat and tomatoes have all been genetically modified.
Rob: Yes, like the purple tomato, which was recently developed in the UK. It has a dark pigment - or colour - which gives it the same potential health benefits as blueberries.