There are several pathways for obtaining energy in organisms other than the oxidation of glucose:

Glycogenolysis : This is the breakdown of glycogen, a storage form of glucose, into glucose molecules. This process can occur in liver and muscle cells and provides a source of glucose for energy production.

Lipolysis : This is the breakdown of stored fats into fatty acids and glycerol. The fatty acids can then be used for energy production via beta-oxidation, a process that occurs in the mitochondria of cells.

Proteolysis : This is the breakdown of proteins into amino acids, which can then be used for energy production via gluconeogenesis, a process that converts amino acids into glucose.