Some foods contain substantial amounts of fibre, particularly cereals, pulses and some fruit and vegetables.

Fibre is an indigestible complex carbohydrate (used to be called starch) and is either water-soluble or water-insoluble. Soluble fibre is absorbed by the body and may help to maintain normal cholesterol levels. Insoluble fibre is not absorbed by the body but acts as a bulking agent to help maintain regular movements and intestinal health.

Most people don't eat the recommended 18g of fibre each day, so they may find that a fibre supplement is the most practical way to up their daily intake.