«In biology, adipose tissue, body fat, or simply fat is a loose connective tissue composed mostly of adipocytes.[1] In addition to adipocytes, adipose tissue contains the stromal vascular fraction (SVF) of cell including preadipocytes, fibroblasts, vascularendothelial cell and a variety of immune cell such as adipose tissue macrophages. Adipose tissue is derived from preadipocytes. Its main role is to store energy in the form of lipids, although it also cushions and insulates the body. Far from being hormonally inert, adipose tissue has, in recent years, been recognized as a major endocrine organ,[2] as it produces hormone such as leptin, estrogen, resistin, and the cytokineTNFα. The two types of adipose tissue are white adipose tissue (WAT), which stores energy, and brown adipose tissue (BAT), which generates body heat. The formation of adipose tissue appears to be controlled in part by the adipose gene. Adipose tissue – more specifically brown adipose tissue – was first identified by the Swiss naturalist Conrad Gessner in 1551.[3]» (wikipedia)