Dietary fibre

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Key points

  • Dietary fibre is plant material that cannot be digested by the human body.

  • Dietary fibre helps the digestive system to move food through the intestines and push the waste material out of the body.

  • Foods that are rich in fibre include beans, pulses, and vegetables such as broccoli and carrots.

What is fibre?


Can you answer these questions based on the video?

1. What is unusual about fibre compared to the other food groups?

2. Name the two types of fibre.

  1. It can’t be broken down by your body.

  2. Soluble and insoluble.

Dietary fibre is made up of plant material, in particular cellulose from plant cell walls that your body cannot break down.

It is essential in helping our body to remain healthy because it helps to move the food we eat through our digestive system, allowing the body to absorb nutrients, whilst moving the waste products easily through our system to be excreted.

Soluble and insoluble fibre

Foods that contain a lot of fibre typically contain both soluble and insoluble fibre.

Soluble fibre dissolves easily in water and is broken down in the large intestine into a gel-like substance. One of its many benefits is to help reduce blood cholesterol. This is found in foods such as chickpeas and carrots.

Insoluble fibre does not dissolve in water. Instead it travels around the digestive tract absorbing fluid and picking up other waste matter. The fibre aids the journey of the waste matter through the intestines and out the other end. This type of fibre helps to prevent constipation. This is found in foods such as rice and nuts.

Quiz - Order the fibre content

How much fibre?

The amount of fibre a person needs depends on their age. For example, 11-16 year olds need about 25 grams of fibre per day.

A diet that is high in fibre can help to reduce hunger and help you to feel fuller for longer.

The correct amount of dietary fibre prevents constipation and reduces the risk of heart disease, stroke, , bowel cancer and .

Test your knowledge

Quiz - Dietary fibre