Behan found fame difficult. He had long been a heavy drinker (describing himself, on one occasion, as "a drinker with a writing problem" and claiming "I only drink on two occasions—when I'm thirsty and when I'm not") and developed diabetes in the early 1950s but this was not diagnosed until 1956. As his fame grew, so too did his alcohol addiction. This combination resulted in a series of famously drunken public appearances, on both stage and television. Behan's favourite drink (a lethal combination for an alcoholic diabetic) was champagne and sherry.