Harry told the Daily Mirror recently: "I'm on the wagon for fitness reasons. I work out really hard and the quickest way to see results is to cut out the booze - especially wine and beer."
Of course, the holiday season is always the hardest time to stick to a healthy plan, but he sounds like he's giving it his best effort, explaining, "I usually have a vodka tonic but I'm totally dry for Christmas. It's the worst timing because everyone's partying but I'm testing myself. Ice cream is off limits too - I love it so much."