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Fibre
Indigestible plant carbohydrate that aids digestion and steadies blood sugar.
Macronutrients
Definition
Dietary fibre is the part of plant foods the small intestine cannot digest. Soluble fibre, in oats, beans and fruit, forms a gel that slows digestion and can help lower cholesterol and blunt blood-sugar spikes; insoluble fibre, in whole grains and vegetables, adds bulk and keeps the bowel regular. Many adults eat well under the commonly recommended 25–30 grams a day. Fibre also feeds beneficial gut bacteria.
Related terms
Carbohydrate
The body's main quick energy source, from sugars, starches and fibre.
Glycemic index
A 0–100 ranking of how fast a carbohydrate food raises blood glucose.
Added sugar
Sugars put into food and drink, best limited to a small share of energy.
Source: Standard references on dietary fibre and gut health. · checked 2026-09-04
Frequently asked questions
What is fibre?
Dietary fibre is the part of plant foods the small intestine cannot digest. Soluble fibre, in oats, beans and fruit, forms a gel that slows digestion and can help lower cholesterol and blunt blood-sugar spikes; insoluble fibre, in whole grains and vegetables, adds bulk and keeps the bowel regular. Many adults eat well under the commonly recommended 25–30 grams a day. Fibre also feeds beneficial gut bacteria.
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