Adipose tissue samples will undergo lipid extraction with the use of chloroform and methanol (according to the Folch method). Briefly, total extract will be vacuum-dried, then resolubilized in a mixture of hexane and methanol to partition neutral (hexane soluble) and polar (methanol soluble) lipids. Triglycerides in the hexane phase will be further purified from other neutral or polar lipids by thin layer chromatography on silica-gel plates. Purified triglycerides will undergo methanol transesterification to produce volatile fatty acids as methyl esters. Separation and quantification of fatty acids will be performed by gas chromatography (BPX-70 phase capillary column, on-column injection, flame-ionization detector).