It should also be low in processed and red meat, high calorie foods, sugary drinks, and alcohol.
Cancer Research UK adds: “The word ‘superfood’ is used to talk about foods that are supposed to improve health and prevent diseases like cancer, but this is not backed up by science.
“You might have heard people call blueberries, broccoli, raspberries and other fruits and vegetables ‘superfoods’.
“It’s true that a healthy, balanced diet can help to reduce the risk of cancer, but it is unlikely that any single food will make much of a difference on its own.”