Chapter Category: Cell Metabolism

From the book Adipose Tissue

Overview: Biological Significance of Fat and Adipose Tissues

Susanne Klaus

From a human point of view fat or adipose tissue is nowadays often considered assuperfluous and undesired, especially considering the current \"emaciated\" beauty ideal of the Western world. This could ultimately lead to the provocative question: \"Do we really need adipose tissue for normal life?\" (see also the introduction to Chapter 3 of this volume). The answer to this question can be approached from different angles. From an evolutionary perspective it was very important especially for homeothermic animals (mammals and birds) to develop the ability to store relatively large amounts of energy. Homeothermic animals are able to keep their body temperature at a constant high level which enables them to be active in cold environments, i.e., very high and low latitudes, during the winter and also at night, thus giving them an advantage over endothermic animals like insects or reptiles. However, this implies a high, continuous energy expenditure for thermogenesis. As food, i.e., an exogenous energy supply is not continuously available, a significant energy reservoir is essential for survival in times of food scarcity. From a clinical point of view, loss of adipose tissue as encountered in syndromes of lipodystrophy or lipoatrophy is associated with severe metabolic complications like diabetes, hypermetabolism, and organomegaly of several organs including the liver (for review see ref. 1). Interestingly, recently developed transgenic mice with virtually no white fat displayed very similar symptoms.2 Together this implies that adipose tissue is indeed important for normal physiological functions and metabolism and is not only an energy reservoir for emergency situations.

Taken from the book

Adipose Tissue

Edited by: Susanne Klaus

More chapters from the book:

From a human point of view fat or adipose tissue is nowadays often considered assuperfluous and undesired, especially considering the current \"emaciated\" beauty ideal of the Western world. This could ultimately lead to the provocative question: \"Do we really need adipose tissue for normal...


The adipose organ ( Fig. 1 ) of mammals is composed of two different tissues: white and brown adipose tissues. 13 In mammals these tissues are organized in distinct depots or are diffuse around or within other organs. \r\n The depots are subcutaneous (anterior and posterior in rats and mice)...


In humans, the development of white adipose tissue (WAT) occurs to a large extent postnatally and continues throughout life, in contrast to the development of brown adipose tissue (BAT) which takes place mainly before birth and disappears thereafter. The acquisition of fat cells appears to be an...


From a human point of view fat or adipose tissue is nowadays often considered assuperfluous and undesired, especially considering the current \"emaciated\" beauty ideal of the Western world. This could ultimately lead to the provocative question: \"Do we really need adipose tissue for normal...


The white adipose tissue is composed of spherical cells with a diameter ranging from 15 to 150 µm (Fig. 2) in aldehyde-fixed and paraffin or resin embedded specimens. \r\n This enormous variability in size is due to the ability of the cell to accumulate different amounts of lipids...


In humans, the development of white adipose tissue (WAT) occurs to a large extent postnatally and continues throughout life, in contrast to the development of brown adipose tissue (BAT) which takes place mainly before birth and disappears thereafter. The acquisition of fat cells appears to be an...


Brown adipose tissue (BAT) is a specialized form of adipose tissue whose function is opposite to classical white fat function. As a thermogenic tissue it is a site of energy dissipation in contrast to the energy storing white fat. Whereas white, i.e., storage fat is known throughout the whole...


Brown adipose tissue (BAT) is a specialized thermogenic adipose tissue with greatimportance for thermoregulation and cold defense of small mammals. As outlined in the previous chapter, the thermogenic function of BAT is intrinsically associated with the uncoupling of the mitochondrial...


Central Nervous System Innervation of Brown Adipose Tissue
Timothy J. Bartness, C. Kay Song, Gregory E. Demas

Environmental factors such as ambient temperature and food availability can affect the survival and reproductive success of animals. This is especially important for small rodents with their increased metabolic rates compared with larger animals, and because of their increased heat loss due to...


Central Nervous System Innervation of White Adipose Tissue
Timothy J. Bartness, Gregory E. Demas, C. Kay Song

The incessant demand for energy by tissues, especially the central nervous system (CNS), is a challenge that must be met for normal physiological functioning and behavior to occur. This is an especially difficult task for small rodents because of their increased energy expenditure as a result of...


Adipose tissue is a highly specialized organ dealing mainly with processes for storage and release of energy. The underlying metabolic routes of these processes are regulated by a complex network to meet the energy requirements of the body. In times of a positive energy balance, i.e., energy...


We are currently undergoing a revolution in our perspectives on the physiological role of white adipose tissue (WAT). Traditionally, white fat has been viewed primarily as a longterm energy storage organ. The deposition of triacylglycerol with twice the energy density of carbohydrate and with...


Adipose Tissue Pathology in Human Obesity
Hans Hauner, Thomas Skurk

Human obesity is characterized by an excess of adipose tissue mass that has potential adverse health consequences and may finally result in a reduced quality of life and life expectancy. 1 In normal-weight subjects the adipose tissue organ constitutes between 10 and 20% of total body mass in...


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