What is the gut?
The gut, or gastrointestinal system, is the long and winding route that food and drink takes through the body. It ensures that all the beneficial nutrients are absorbed and used for energy, growth and repair. You can think of it as a number of hollow organs connected by a tube which starts at the mouth and ends at the anus. Once food has been swallowed, the oesophagus delivers it to the stomach. It then goes through the small and large intestines before waste – the material the body cannot use – is expelled as a stool. Solid organs help along the way: the liver, pancreas and gall bladder. The entire digestive tract is about 5m long in a typical adult, with the small intestine making up two-thirds, but there is plenty of variation between people. Spread the whole lot out, and the surface area of the gut that comes into contact with food is about 32m2. That’s about half the size of a badminton court.
