Fibre, recommended by experts as protection against bowel cancer, may actually worsen a person's chances of developing the disease, a new study suggests. Researchers found that patients given a fibre supplement were significantly more likely to suffer a recurrence of polyps in the gut that can lead to cancer. The findings are the latest in a series of results now starting to cast doubt on claims that fibre prevents bowel cancer. But experts stress that they should not put people off from eating vegetables, fruits and cereals, which benefit health generally. Dr Tim Key, a nutrition specialist with the Imperial Cancer Research Fund, said it would be misleading to describe the soluble supplement used in the study as 'dietary fibre'. The findings should not be taken to mean that natural fibre in the diet is harmful, he added.