<Li> IU = International units </Li> <Tr> <Td_colspan="2"> Percentages are roughly approximated using US recommendations for adults . Source: McDonald's USA Product Nutrition </Td> </Tr> <P> The Big Mac is a hamburger sold by international fast food restaurant chain McDonald's . It was introduced in the Greater Pittsburgh area, United States, in 1967 and nationwide in 1968 . It is one of the company's signature products . </P> <P> The Big Mac was created by Jim Delligatti, an early Ray Kroc franchisee, who was operating several restaurants in the Pittsburgh area . It was invented in the kitchen of Delligatti's first McDonald's franchise, located on McKnight Road in suburban Ross Township . The Big Mac had two previous names, both of which failed in the marketplace: the Aristocrat, which consumers found difficult to pronounce and understand, and Blue Ribbon Burger . The third name, Big Mac, was created by Esther Glickstein Rose, a 21 - year - old advertising secretary who worked at McDonald's corporate headquarters in Oak Brook, Illinois . The Big Mac debuted at Delligatti's Uniontown, Pennsylvania restaurant in 1967, selling for 45 cents . It was designed to compete with Big Boy restaurants' Big Boy sandwich; Eat'n Park was the Pittsburgh area's Big Boy franchisee at the time . The Big Mac proved popular, and it was added to the menu of all U.S. restaurants in 1968 . </P>

When did mcdonald's start serving the big mac