I'd read things, like people criticizing me. But no one likes to read stuff about that, and probably the main thing that was getting to me was me mum's illness.

Osbourne lost 23 kg in Thailand at a Muay Thai martial arts camp in Pattaya in order to be fit enough to climb El Capitan (which he achieved) whilst filming the first series of Jack Osbourne: Adrenaline Junkie. Osbourne has since pursued a career as a fitness and travel reporter presenting shows such as Jack Osbourne: Adrenaline Junkie (2005-09) and BBC's Saving Planet Earth (2007). Adrenaline Junkie focuses on Osbourne's training for sports like rock climbing mountaineering and a jungle trek in Belize from the Chiquibul Chamber through dense jungle ending at Caracol ruins (Guided by the UK extreme conservation organisation Trekforce).

He is best known as a star of MTV's reality series The Osbournes (2003-05) along with his father Ozzy mother Sharon and sister Kelly. He was diagnosed with relapsing remitting multiple sclerosis in 2012.