Ketone bodies are three water-soluble compounds that are produced as by-products when fatty acids are broken down for energy in the liver and kidney. They are used as a source of energy in the heart and brain. In the brain, they are a vital source of energy during fasting. Source: [[wikipedia:Ketone_bodies|Wikipedia]] This pathway was inferred from Homo sapiens pathway [http://www.wikipathways.org/index.php?title=Pathway:WP311&oldid=21335 WP311(r21335)] with a 55% conversion rate. f92 ketone bodies metabolic pathway PW:0000069 Pathway Ontology 14769483 PubMed Pathways and control of ketone body metabolism: on the fringe of lipid biochemistry. Prostaglandins Leukot Essent Fatty Acids 2004 Fukao T Lopaschuk GD Mitchell GA