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After his Grammys appearance, the "I'm Not the Only One" singer revamped his diet and showed up slimmer and slimmer throughout 2015. "When I was at school and wasn't having a great time or when music wasn't going very well. I would eat," he told 60 Minutes Australia at the time. "Eating would make me feel better. When I felt lonely, I would eat."
When he arrived at the GQ Men of the Year Awards in September, he looked like a whole new man — more luscious locks included. Plus, he proved he can pull off glasses.