The Good Gut Guide: Help for IBS, Ulcerative Colitis, Crohn's Disease, Diverticulitis, Food Allergies and Other Gut Problems

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Food travels slowly through the colon – the average journey time is 12–48 hours to get through this 1½–2 metre (5–6ft) long tube. The colon walls secrete mucus to lubricate the waste matter and help it move along smoothly. In fact, mucus-secretion happens all the way along the gut – coming from a thin layer of cells called the mucous membrane. This membrane also protects the gut wall against bacteria and the acidity of the digestive enzymes, and helps ensure that it is our food and not our gut that gets digested when we eat. The rectum is about 15cm (6in) long and lies between the colon and the anal canal. It acts as a reservoir for the faeces. When it becomes full, nerve endings trigger strong muscular contractions that make us want to empty our bowels. This happens when the anal sphincter muscles open, allowing the waste to be expelled.