to have people simply fawning over him and his physique and forgetting about his music when he first got into shape but that's what happened.

His musicianship ended up taking a backseat to the whole sex symbol thing and as his trainer pointed out, he wasn't getting into shape for the right reasons which is why D became a prisoner to the image he helped to create. At least this time, by making it more of a lifestyle, he won't have to worry about the weight fluctuations he went through the 1st time.