Fat, or adipose tissue, is found in several places in your body. Generally, fat is found underneath your skin (subcutaneous fat). There's also some on top of each of your kidneys. Other locations depend upon whether you are a man or woman:
*An adult man tends to carry body fat in his chest, abdomen and buttocks, producing an "apple" shape.
*An adult woman tends to carry fat in her breasts, hips, waist and buttocks, creating a "pear" shape.
*The difference in fat location comes from the sex hormones estrogen and testosterone.
Your body contains two types of fat tissue:
White fat - important in energy metabolism, heat insulation and mechanical cushioning.
Brown fat - found mostly in newborn babies, between the shoulders; important for thermogenesis (making heat).
Fat tissue is made up of fat cells. Fat cells are a unique type of cell. You can think of a fat cell as a tiny plastic bag that holds a drop of fat:
White fat cells are large cells that have very little cytoplasm, only 15 percent cell volume, a small nucleus and one large fat droplet that makes up 85 percent of cell volume.
Brown fat cells are somewhat smaller, are loaded with mitochondria and are composed of several smaller fat droplets. The mitochondria are able to generate heat. Fat cells are formed in the developing fetus during the third trimester of pregnancy, and later at the onset of puberty, when the sex hormones "kick in." It is during .......
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