Fibre's different jobs
Explore three jobs that different fibres can do.
Different types of fibre do different jobs. They can add structure, form a soft gel or provide material that gut microbes can use.
What to know
Some fibres help add structure and bulk to stool. Others dissolve or form a gel that can help hold water. Fermentable fibres can be used by gut microbes. These categories overlap: one food can contribute more than one type of fibre, and foods contain different amounts and mixtures.
Oats, lentils and fruit can contribute gel-forming or fermentable fibres as well as other fibre. Wholegrain foods and vegetable skins can add more structural fibre. This does not make one type universally better than another. Variety provides a broader mix.
How much fibre is comfortable differs between people and situations. Building up gradually and discussing individual needs with a doctor or Accredited Practising Dietitian is especially important if symptoms are active, intake has been restricted, or a procedure requires temporary changes.
Match foods with their fibre roles
For each food, choose every fibre role that may apply. A food can have more than one role.
- Structure and bulk: Fibres that keep more of their structure can contribute bulk.
- Gel and softness: Some fibres dissolve or form a gel that holds water.
- Material for microbes: Some fibres can be fermented by gut microbes.
| Food example | Structure and bulk | Gel and softness | Material for microbes |
|---|---|---|---|
| Oats | — | Yes | Yes |
| Lentils | Yes | Yes | Yes |
| Pear | Yes | Yes | Yes |
| Wholegrain bread | Yes | — | Yes |
Why can one food fit into more than one fibre group?
Show the answer
Foods contain a mixture of fibres, and each type can do a different job.
Prepare a question for your care team
- Which kinds of fibre are most relevant to discuss for my situation?
- If I change my fibre intake, how gradually should I do that with my care team?
Sources
- Nutrient Reference Values for dietary fibre — Australian Government and New Zealand Ministry of Health (accessed 2026)
- Australian Dietary Guidelines — National Health and Medical Research Council (2013)