Xand van Tulleken
Alexander "Dr Xand" van Tulleken is a British doctor, TV presenter and an identical twin. He is best known for presenting the CBBC children's series Operation Ouch! with his slightly younger twin brother Chris, and the Channel 4 show How to Lose Weight Well.
He has presented many documentaries over the years, including an episode of Horizon discussing male suicide and a BBC programme on the European migrant crisis. Van Tulleken can often be seen offering up his own body for science experimentation in diet show How to Lose Weight Well, as well as in BBC Horizon episodes "Sugar vs Fat" and "Is Binge Drinking Really That Bad?"
