The reality star previously attributed his dramatic slimdown to rigorous fitness training, as well as abstaining from drugs and alcohol.

Why This Matters

Jack Osbourne fires back at those f–king insane trolls! 💥 He's been working hard, not f–king around. His fitness journey is proof! 🏋️‍♂️✨

He says he's just following his fitness routine and avoiding drugs/alcohol. It's all about health & looking after himself. ❤️💪 #JackOsbourne #CelebrityHealth #FitnessJourney

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