I went a week without sleep ,I seriously doubt that this is true.
If he went a month I might believe it, but decades? This guy must be consuming somthing like maybe drinking his own piss or sneaking fruits and nuts when nobody is looking.
Perhaps this "hospital" is in on this potential scam. Remember, we have no idea how good the medical system is in India. They may just be the sorts of people willing to lie to support their religion. That's more believable than someone defying biology. He could also be dead and those sounds of him talking are just gas escaping :D.
"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." ~ Charles Babbage (1791-1871)
It's bull. They keep catching so-called fakirs pretending to be able to survive without nutrition down there... one was caught when he left the hospital to go pick up some McD's for lunch.