The study, which began in the 1990s, has enrolled half a million people in ten different countries, including 90,000 in England.

Dr Key says: "The EPIC study represents a major step forward. We have already been able to measure large differences in diet across Europe. Over the next five to ten years we can compare the diets of those who get cancer with those who don't.

"Our research is already suggesting some potential links and as time passes, we will find out more."

Cancer Research UK's Director of Clinical and External Affairs, Professor Robert Souhami says: "After giving up smoking, having a healthy diet and lowering alcohol intake are the most important ways of reducing the risk of cancer.

"The EPIC study is a very valuable project because it is beginning to tell us exactly which foods can help to prevent cancer and which should be avoided." cancerresearchuk