Metabolism is the chemical process catalyzed by certain enzymes by which organisms convert various substances to energy in order to sustain life. Metabolism antibodies are crucial for studying glucose, lipid, protein and nucleotide metabolism. It can be broken into two categories: catabolism and anabolism. Cellular respiration, for example, is a catabolic process as it breaks down substances. Building up nucleic acids and proteins, on the other hand, is anabolic. Understanding metabolic pathways is crucial to epigenetic research and metabolic disorders such as diabetes, phenylketonuria, and hyperthyroidism.