Grape-Nuts is a breakfast cereal eveloped by C. W. Post in 1897. Post was a patient and later competitor of the 19th-century breakfast food innovator, Dr. John Harvey Kellogg. Neither grapes nor nuts have ever been ingredients in the cereal. The original formula for Grape-Nuts called for grape sugar, which is composed mostly of glucose unlike most other sugar sources and food sweeteners which are principally sucrose. This, combined with the "nutty" flavor of the cereal inspired its name. But some employees at Post claim that the cereal got its name because the tiny nuggets resemble grape seeds or grape "nuts".