Gregg Wallace 'can't wear underwear' due to autism diagnosis, pals say Gregg Wallace was recently diagnosed with autism as friends have spoken out on how it impacts him amid allegations over his behaviour Share Article Bookmark By Gemma Jones, Showbiz Reporter 09:33, Thu, Jul 10, 2025 Updated: 09:34, Thu, Jul 10, 2025 Gregg Wallace reportedly doesn't wear underwear (Image: BBC) According to friends of Gregg Wallace, the former Masterchef host is "unable to wear underwear".