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The triesters of fatty acids with glycerol (1,2,3-trihydroxypropane) compose the class of lipids known as fats and oils. These triglycerides (or triacylglycerols) are found in both plants and animals, and compose one of the major food groups of our diet.
Common lipid groups include waxes, steroids, fats, and phospholipids. One type of lipid monomer, a fatty acid, consists of one carboxyl group at the end of a linear hydrocarbon containing at least four carbon atoms. Because hydrocarbon chains are nonpolar, fatty acids with long hydrocarbon chains are mainly hydrophobic (insoluble in water) despite having one polar functional group.