A guy in India says he does, and NASA are taking him seriously:

Hira Ratan Manek - a 64-year-old mechanical engineer went on a pilgrimage to the Himalayas in 1995 and stopped eating completely on his return.

His wife, Vimla, said: "Every evening he looks at the sun for one hour without batting an eyelid. It is his main food. Occasionally he takes coffee, tea or some other liquid."

Last June, scientists from the US space agency verified that Manek spent 130 days surviving only on water, the report said.

They even named this subsistence on water and solar energy after him: The HRM (Hira Ratan Manek) Phenomenon.

Mr Manek is now in the US to show NASA's scientists how he survives without food.