<P> In the UK, Lucozade Energy was originally introduced in 1929 as a hospital drink for "aiding the recovery;" in the early 1980s, it was promoted as an energy drink for "replenishing lost energy ." One of the first post-Forty Barrels energy drinks introduced in America was Dr. Enuf . Its origins date back to 1949, when a Chicago businessman named William Mark Swartz was urged by coworkers to formulate a soft drink fortified with vitamins as an alternative to sugar sodas full of empty calories . He developed an "energy booster" drink containing B vitamins, caffeine and cane sugar . After placing a notice in a trade magazine seeking a bottler, he formed a partnership with Charles Gordon of Tri-City Beverage to produce and distribute the soda . Dr. Enuf is still being manufactured in Johnson City, Tennessee and sold sparsely throughout the nation . </P> <P> In Japan, the energy drink dates at least as far back as the early 1960s, with the launch of the Lipovitan brand . However, in Japan, most of the products of this kind bear little resemblance to soft drinks, and are sold instead in small brown glass medicine bottles, or cans styled to resemble such containers . These "eiyō dorinku" (literally, "nutritional drinks") are marketed primarily to salarymen . Bacchus - F, a South Korean drink closely modeled after Lipovitan, also appeared in the early 1960s and targets a similar demographic . </P> <P> In 1985, Jolt Cola was introduced in the United States . Its marketing strategy centered on the drink's caffeine content, billing it as a means to promote wakefulness . The drink's initial slogan read: "All the sugar and twice the caffeine ." </P> <P> In 1995, PepsiCo launched Josta, the first energy drink introduced by a major US beverage company (one that had interests outside energy drinks), but Pepsi discontinued the product in 1999 . Pepsi would later return to the energy drink market with the AMP brand . </P>

What makes an energy drink an energy drink