"As soon as Cherry told me she was pregnant, life shifted, in terms of work and health and what I was putting into my body, be it food or alcohol," he told BBC Radio 1's Greg James.
"I started exercising more and my routine became a bit more healthy."
The star also changed his work habits, working "nine to five" instead of finishing recording sessions at 2am.
"It actually freaks out producers," he said. "I was in Los Angeles working with these producers that usually start working at 6pm and finish at 6am with people like Post Malone and Dua [Lipa].