See also: Kitchen and Cooking Tips: Fish Odor
In "The Tempest", Shakespeare describes a character with "a very ancient and fish-like smell." This is an example of a genetic disorder which causes a person's breath and perspiration to smell like rotting fish. It is caused by a lack of the body's ability to produce an enzyme which processes an odorous protein produced by digestive bacteria. People with this relatively rare disorder must avoid eating seafood, liver, eggs and various other foods which lead to the production of the offending enzyme.