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Catabolic reactions give out energy. They are exergonic. In a catabolic reaction large molecules are broken down into smaller ones. For example, the reverse of the condensation reactions described above, i.e. hydrolysis reactions, are catabolic.
When fatty acids in your food are joined to form a triglyceride, thatâs an anabolic reaction. Catabolic reactions are the breakdown of organic molecules for energy. Breaking down sugars for energy, fat for energy, and so forth are all catabolic.