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Nutrition expert Prof Janet Cade, from the University of Leeds, said the paper "provides important evidence showing that overall diet can influence risk of colorectal cancer".

Julie Cornish, a colorectal surgeon from Cardiff and Vale health board said by the time patients reached her they had "typically been suffering for some time".

Certain ultraprocessed foods high in omega-6 fatty acids may be preventing the body from fighting off colorectal cancer cells, a recent study published in the British Society of Gastroenterology has found.

Bethany's endometriosis had begun to affect her bowel and it was recommended she see a colorectal surgeon for further examination.

There were nine cases of colorectal cancer and four of breast cancer.