dietary fibre
Medium (Common in health, nutrition, and everyday wellness contexts)Neutral to formal, common in technical, medical, and general informative contexts.
Definition
Meaning
The indigestible parts of plant foods, such as cellulose, that aid digestion and are considered beneficial for health.
A collective term for non-starch polysaccharides and other plant components that resist digestion in the human small intestine, passing into the large intestine where they may be fermented or add bulk. It is an essential component of a healthy diet.
Linguistics
Semantic Notes
Often considered a mass noun, uncountable in standard usage. The spelling 'fiber' is used in American English. The term encompasses both soluble and insoluble types with different health functions.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'fibre' (UK) vs. 'fiber' (US). The compound term 'dietary fibre/fiber' is standard in both. Pronunciation of the second element differs (/ˈfaɪ.bər/ US vs. /ˈfaɪ.bə/ UK).
Connotations
Identical in both varieties, strongly associated with health, nutrition, and digestive wellness.
Frequency
Equally frequent in health-related discourse in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[Verb] + dietary fibre (e.g., consume, eat, get, include)[Adjective] + dietary fibre (e.g., high, low, soluble, insoluble)[Preposition] + dietary fibre (e.g., in, of, with)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[Not commonly idiomatic; a technical/descriptive term]”
Usage
Context Usage
Business
Used in marketing for food products, supplements, and health foods (e.g., 'Now with added dietary fibre').
Academic
Used in nutritional science, medicine, and public health research papers discussing digestion, gut health, and disease prevention.
Everyday
Common in conversations about healthy eating, dieting, digestion problems, and food labels.
Technical
Precise term in dietetics, gastroenterology, and food science, often specified as soluble (e.g., pectin) or insoluble (e.g., cellulose).
Examples
By Part of Speech
verb
British English
- [Not standard; the term is a noun. One might 'fibre-fortify' a food, but this is rare.]
American English
- [Not standard; the term is a noun. Manufacturers may 'fiber-enhance' products.]
adverb
British English
- [Not derived; 'fibrously' exists but is unrelated to the nutritional concept.]
American English
- [Not derived; 'fiber-wise, this bread is good' is informal and rare.]
adjective
British English
- A high-fibre diet is recommended.
- Look for fibre-rich breakfast cereals.
American English
- A high-fiber diet is recommended.
- Look for fiber-rich breakfast cereals.
Examples
By CEFR Level
- Fruit and vegetables have dietary fibre.
- Eat foods with dietary fibre for your health.
- Doctors say we should eat more dietary fibre to help digestion.
- This cereal is a good source of dietary fibre.
- Increasing your daily intake of dietary fibre can significantly improve gut motility and overall health.
- The nutritional label clearly shows the dietary fibre content per serving.
- The study elucidated the distinct mechanisms by which soluble and insoluble dietary fibre modulate the gut microbiome.
- Public health policies increasingly advocate for the fortification of staple foods with dietary fibre to address nutritional deficits.
Learning
Memory Aids
Mnemonic
Think: DIETARY FIBRE = Food's In-Built Broom / Rake for your Insides. It sweeps/rakes through your digestive system.
Conceptual Metaphor
A CLEANING TOOL / SCRUB BRUSH FOR THE GUT; INTERNAL REGULATOR; DIETARY SCAFFOLDING that provides structure and passage.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque 'диетическое волокно' which sounds unnatural. The standard term is 'пищевые волокна' (food fibres).
- Do not confuse with 'клетчатка' (cellulose), which is only one specific type of dietary fibre. 'Клетчатка' is, however, a common colloquial synonym for dietary fibre in Russian.
Common Mistakes
- Using it as a countable noun (e.g., 'a dietary fibre' - incorrect; 'a source of dietary fibre' - correct).
- Confusing 'fibre' with 'fiber' in inappropriate regional contexts (e.g., using 'fiber' in a UK publication).
- Pronouncing 'dietary' as /ˈdiː.tər.i/ instead of /ˈdaɪ.ə.tər.i/.
Practice
Quiz
Which of the following is a primary function of insoluble dietary fibre?
FAQ
Frequently Asked Questions
Soluble fibre (e.g., in oats, apples) dissolves in water to form a gel, helping slow digestion and regulate blood sugar/cholesterol. Insoluble fibre (e.g., in wheat bran, vegetables) does not dissolve; it adds bulk to stool and helps it pass more quickly through the gut.
Yes, 'roughage' is a common, slightly older or more general synonym for dietary fibre, particularly emphasising its role in adding bulk to the diet. 'Dietary fibre' is the more precise, modern nutritional term.
Yes, a sudden large increase can cause bloating, gas, and cramps. It's important to increase intake gradually and drink plenty of water. Very high intakes may also interfere with the absorption of some minerals.
In many labelling systems, dietary fibre is a subset of total carbohydrates. It is often listed separately because it is not digested for energy like sugars and starches. Labels may show 'Total Carbohydrate', then indented under it: 'Dietary Fibre' and 'Sugars'.