Medics are flummoxed by an Indian hermit who claims not to have eaten or drunk anything for 68 years - but is still in perfect health.
Prahlad Jani, a holy man, or fakir, who is 76-years-old, has just spent 10 days in Sterling Hospital, Ahmedabad in a specially prepared room, with a sealed-off toilet and constant video surveillance.
To help the doctors verify his claims, Mr Jani agreed to avoid bathing for his time in hospital. The only fluid he was allowed was a small amount of water, to use as mouthwash.
One hundred millilitres of water were given to him, and then collected and measured in a beaker when he spat it out, to make sure none had been drunk.
During that time, he did not consume anything and "neither did he pass urine or stool", according to the hospital's deputy superintendent, Dr Dinesh Desai. Yet doctors say he is in fine mental and physical shape, reports BBC Online.
Most people can live without food for several weeks, with the body drawing on its fat and protein stores. But the average human can survive for only three to four days without water.
Followers of Indian holy men and ascetics have often ascribed extraordinary powers to them, but such powers are seldom subject to scientific inspection. "A series of tests conducted on him show his body mechanism is that of a normal person," said Dr Desai.
Mr Jani spends most of his time in a cave near the Ambaji temple in Gujarat state. "I feel no need for food and water," says Mr Jani, who claims he was blessed by a goddess at the age of eight and has lived in caves ever since.
A statement from Ahmedabad's Association of Physicians says that despite no water entering his body, urine nonetheless appeared to form in his bladder - only to be re-absorbed by the bladder walls.