<unk>  are three water soluble compounds that are produced as by-products when fatty acids are broken down for energy. They are used as a source of energy in the heart and brain. In the brain, they are a vital source in fasting.
The three<unk>  are acetoacetate, beta-hydroxybutyrate and acetone, although beta-hydroxybutyrate is not technically a<unk>  but a carboxylic acid.
Ketone bodies
Chlorophyll
Horror vacui
Methaemoglobin
Choline theophyllinate
Americium-243
Sodium phosphates
Ankyrins