Vegemite is the brand name of a yeast extract chiefly utilized as a spread for toast and sandwiches in Australia and New Zealand. Invented in 1923 by Fred Walker and Dr. Cyril Callister, the dark brown, pasty substance that later became a Kraft Foods product appears to be an acquired taste and has never been lucratively promoted in other parts of the world. Its initial success in Australia is often attributed to early advertising efforts that focused upon the health benefits children receive from eating vegemite, which is rich in vitamins from the B group. Most Americans, however, first became acquainted with vegemite in the early 1980s when a reference to the spread was made by the Australian band Men at Work in their hit song "Down Under."