Elton John, 78, gave emotional new details about his longtime struggle with food addiction in the new sports documentary, Give Me the Ball!, which premiered at the Sundance Film Festival yesterday. While the film centers on the life and accomplishments of tennis legend Billie Jean King, 82, it also documents King and John’s decade-spanning friendship. The pair first met in the early 1970s, eventually bonding over their sexualities and shared experiences with food addiction. Longtime friends Elton John and Billie Jean King photographed at the Forest Hills Tennis Stadium in New York City, circa 1975. Images Press/Getty ImagesThe singer added that food addiction poses a unique challenge that other substances don’t: “You have to eat to stay alive.