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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.
Lipids are molecules defined by several characteristics, the chief of which is their avoidance of water -- referred to as their nonpolar nature. Lipids are then divided into two categories. One category contains molecules that are long chains of carbon atoms accompanied by hydrogen atoms, such as fatty acids. The other category is molecules in which carbon atoms are attached as multiple ring structures that are fused together, such as cholesterol.