Metabolic or endogenous water is formed in the body as a result of a large number of biochemical transformations. Its greatest amount is formed during the oxidation of carbohydrates and fats. For example, when splitting 100 g of fat, not only a significant amount of energy is released, but also 134 ml of endogenous water. This property of fats allows many animals (amphibians, reptiles and mammals) to hibernate in an unfavorable season and not lead an active lifestyle. The same quality of fat makes possible transoceanic flights of some butterflies (swallowtail).
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