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Fats are compounds (Ester) which are decomposed into glycerol and fatty acids by digestion.
 

Left: Self made bead models of 3 water molecules and 1 fat molecule.
Middle: Self made bead models of 3 fatty acid molecules and 1 glycerol molecule.
Rights: Composition of Becel margarine. 80 of 100 g are fat, 20 of 100 g are water.