In July 2003, noted skeptic, James Randi, investigated the claim that Hira Raten Manek was being tested by NASA.
Well, the official NASA spokesperson, Dolores Beasley, has now said she has no idea why press reports had claimed that NASA had invited Manek. NASA has no record of him being involved with them, in any way whatsoever. So, it's all a lie. What else is new?
This isn't much of a reference - one guy saying a spokesperson denied it.
But, really, for claims of this calibre (i.e. living without food, a claim that has been repeated made but never demonstrated in a reasonable test) how good does the counter-evidence have to be?
(That last link discusses other 'tests' that Hira Raten Manek submitted to. Note the lack of reports of independent tests where they don't somehow neglect to ensure he isn't eating.)