Narrative review compares brown and white adipose tissue anatomy and metabolism in adults.
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Key Takeaway
Note anatomical and metabolic differences between brown and white adipose tissue in adults.
This narrative review focuses on the comparative anatomy and metabolic profiles of brown adipose tissue (BAT) versus white adipose tissue (WAT) in adult humans. The scope of the publication is to describe the structural and functional characteristics of these distinct tissue types based on existing literature. No specific numerical outcomes, primary results, or secondary outcomes were reported in the provided source data. The review does not include a sample size or specific setting details, as these were not reported in the input.
The authors discuss the metabolic differences between BAT and WAT, noting that specific quantitative data regarding these profiles were not reported in the source. Safety information, including adverse events, serious adverse events, discontinuations, and tolerability, was not reported. Consequently, the review does not provide data on drug interactions or specific clinical risks associated with these tissues.
Limitations acknowledged by the source include the lack of reported primary outcomes and the absence of specific numerical data. The review does not establish causality or provide practice relevance recommendations. Funding sources and conflicts of interest were not reported. The certainty of findings is limited by the narrative nature of the review and the absence of quantitative synthesis.
View Original Abstract ↓
Adipose tissue is a dynamic metabolic organ that plays a central role in energy homeostasis, endocrine signaling, and thermoregulation (Forner et al., 2009). Traditionally, adipose tissue has been classified into two major types: white adipose tissue (WAT), which primarily stores energy as triglycerides, and brown adipose tissue (BAT), which dissipates energy as heat through non-shivering thermogenesis. While WAT is widely distributed throughout the human body, BAT is more abundant in small mammals and infants but remains present and metabolically active in specific regions of adult humans. Recent molecular biology discoveries and imaging methods have reshaped the physiological status of BAT and recognized the presence of beige or brite adipocytes, which develop in WAT depots and display thermogenic potential. This led to renewed attention on adipose tissue plasticity and how it is relevant for metabolic health, obesity, and associated metabolic disorders. This narrative review compares the anatomical distribution, cellular morphology, developmental origins, and physiological functions of WAT and BAT in humans. It also summarizes imaging modalities used to identify metabolically active adipose tissue and discusses emerging concepts such as adipose browning, endocrine signaling, and therapeutic activation of thermogenic fat.
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