TV doctor and columnist Michael Mosley, known for popularising the 5:2 diet, has gone missing in Greece while on holiday, his agent has confirmed.
A search and rescue operation is under way in Symi, one of the Dodecanese Islands, for Dr Mosley, known for his appearances on The One Show and This Morning, along with fronting documentaries.
Drones and police are involved in the search.
A statement from police, which has been translated, said they were informed about the "disappearance of the 67-year-old British national on the island" on Wednesday.
It opened an "investigation" to find him and a search is being "carried out by the Fire Brigade with the assistance of forces of the Hellenic Police, Civil Protection (a local and regional coordination agency), volunteers and a police dog, while technical means such as drones are also used to locate the missing person".
Fire services said they were asked by police on Thursday at about 11.15am to help the search.
Six firefighters, a vehicle and a drone team were sent from the nearby island of Rhodes to help, arriving in Symi at about 2pm.
A local Facebook group said Dr Mosley went for a walk from Saint Nikolas Beach at around 1.30pm Greek time on Wednesday and had not returned by Thursday morning.
Alongside a recent picture of Dr Mosley wearing a blue cap, polo shirt and shorts, the appeal said: "Have you seen this man? He set off to walk back from St Nick's at about 13.30 and failed to make it home."
Dr Mosley is also a columnist for the Daily Mail, and has made a number of films about diet and exercise among his documentaries.
The 67-year-old broadcaster did the Channel 4 show Michael Mosley: Who Made Britain Fat? and was part of the BBC series Trust Me, I'm A Doctor.
He also lived with tapeworms in his guts for six weeks for the documentary Infested! Living With Parasites on BBC Four.
Dr Mosley has been given an Emmy nod for BBC science documentary The Human Face, presented by John Cleese and featuring a raft of human faces including Elizabeth Hurley, Pierce Brosnan and David Attenborough.
Mosley has four children with his wife Clare Bailey Mosley, also a doctor, author and health columnist, who wrote the recipe book Fast 800 Easy.
The couple, who have hosted theatre show tours together, recently attended the Hay Festival in the UK where Mosley presented a special edition of his Radio 4 series and podcast Just One Thing.
Source: Press Association
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