How fibre works, and how we get it

http://www.tmnaturehealth.co.uk/tnt_(532g).htm

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Dietary fibre is found in fruit, vegetables and whole grains, it is essential for maintaining a healthy digestive system. Fibre can't be fully digested and is often called bulk or roughage.
There are 2 types of fibre found in foods, soluble and insoluble.
Soluble fibre can dissolve in water it is found in beans, fruit and oat products, it helps to lower blood fats and maintain blood sugar.
Insoluble fibre can't dissolve in water so it passes through the digestive system.
It is found in whole grain products and vegetables which increases the rate at which food passes through the gut.