The 46-year-old is a highly respected official in rugby, and was the referee for the 2015 World Cup final between Australia and New Zealand at Twickenham.
However, ahead of the airing of a BBC Panorama programme focussed on eating disorders among men, the Welshman said that during England's tour of Argentina in June, where he was officiating, his bulimia returned.
"I thought I was in control but since making the Panorama programme, I've realised I'm not," he said on the BBC website (www.bbc.com).
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
"I came back from refereeing the England summer tour in Argentina a few weeks ago. While I was out there, I made myself sick three to four times."
(Reporting by Christian Radnedge; Editing by Toby Davis)
