brown fat: meaning, definition, pronunciation and examples
C1/C2Medical, Scientific, Health/Wellness
Quick answer
What does “brown fat” mean?
A type of body tissue that generates heat by burning calories, especially in response to cold temperatures or overfeeding.
Audio
Pronunciation
Definition
Meaning and Definition
A type of body tissue that generates heat by burning calories, especially in response to cold temperatures or overfeeding.
Brown adipose tissue, distinguished from white fat by its high number of mitochondria (which give it its brownish color), its vascularisation, and its role in thermogenesis and energy expenditure. It is particularly abundant in infants and hibernating mammals, but adults retain smaller amounts.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; 'brown fat' is universal in scientific English. Spelling follows national conventions for surrounding text (e.g., 'behaviour' vs. 'behavior').
Connotations
Identical. Purely technical/physiological.
Frequency
Equally low-frequency outside specialised contexts. More common in UK/EU medical literature historically due to earlier research focus.
Grammar
How to Use “brown fat” in a Sentence
N of N (depots of brown fat)Adj+N (active brown fat)V+N (activate brown fat)Vocabulary
Collocations
Examples
Examples of “brown fat” in a Sentence
adjective
British English
- The brown-fat activity was measured using a PET scan.
- They studied brown-fat metabolism in rodents.
American English
- Brown-fat activation is a key metabolic response.
- Researchers looked for brown-fat deposits in the adults.
Usage
Meaning in Context
Business
Rare, except in biotech or pharmaceutical investment reports discussing metabolic therapies.
Academic
Primary context. Used in physiology, endocrinology, and metabolic research papers.
Everyday
Increasingly found in fitness, wellness, and dieting articles discussing metabolism and weight loss.
Technical
Standard term in medical textbooks, clinical studies, and nutritional science.
Vocabulary
Synonyms of “brown fat”
Neutral
Weak
Vocabulary
Antonyms of “brown fat”
Watch out
Common Mistakes When Using “brown fat”
- Using 'brown fats' as a countable plural (usually uncountable).
- Confusing its function with white fat.
- Misspelling 'adipose'.
FAQ
Frequently Asked Questions
Yes, though the amount is limited. Regular cold exposure and certain types of exercise may increase its amount and activity, but the effect size in humans is a subject of ongoing research.
In informal wellness contexts, it is often called 'good fat' because it burns calories. However, scientifically, 'good fat' is ambiguous and can also refer to dietary fats like omega-3s. Brown fat is a type of tissue, not a dietary component.
In humans, main depots are found around the neck, collarbones, along the spine, and around major organs like the kidneys and heart.
Brown fat is 'classical' thermogenic fat with a developmental origin distinct from white fat. Beige (or 'brite') fat is white fat that has acquired some brown-fat-like properties (thermogenesis) in response to stimuli like cold or exercise.
A type of body tissue that generates heat by burning calories, especially in response to cold temperatures or overfeeding.
Brown fat is usually medical, scientific, health/wellness in register.
Brown fat: in British English it is pronounced /ˌbraʊn ˈfæt/, and in American English it is pronounced /ˌbraʊn ˈfæt/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: BROWN fat BURNS calories to keep you warm (both start with 'B'). Unlike white fat which just stores.
Conceptual Metaphor
FAT AS FUEL (specifically, brown fat as an active furnace; white fat as a passive warehouse).
Practice
Quiz
What is the primary physiological function of brown adipose tissue?