If you watch the full documentary, you will see that there are other cases from other hospitals, in europe - where this was repeated - totally unconnected to the prahlad jani case (as far as is visible). one of the alleged breatharians is himself a medical doctor.
in the case of prahlad jani, the page on wikipedia also states:
In September 2010, Dr Shah announced that scientists from Austria and Germany had offered to visit India to carry out further research on Jani, and scientists from the United States had also offered to join the research. Jani has expressed interest in cooperating in further investigations.
The investigations in India involved 10-40 people monitoring him as far as i am aware. No evidence is presented by the 'rationalist' who claimed it was a farce and I have not had access to the full video footage to confirm or reject the claims. Since I was not present for any of the investigations, I can only go by what I have had access to and from a neutral standpoint I have to say that it 'looks' genuine - but I can accept that for some unknown reason it could be a deception. Who exactly stands to gain from such a deception is unanswered though... 'Powerful' people in multiple continents releasing a documentary that few have seen for a purpose that stands to make them no money and that will attract ridicule? don't sound very 'rational' ;)