A group of researchers issued a warning yesterday that ingestion of a commonly-found substance can dramatically increase the chances of dying. The substance, known as "food", can be found in many shops and homes in Britain and around the world, although it is rarer in parts of Africa. A survey of a number of people in a place showed that 84% of those who ate food suffered ill health at some point over a subsequent period, with 21% of them showing a marked increase in the incidence of cancer, heart disease and other ailments. Dr Marion Chung, co-author of the report, said, "This report should be a wake-up call to those people who have been eating food on a regular basis without paying attention to the consequences. If they continue eating, although it may keep them going in the short term, in the long run they will die."