I don’t know about the Bhagwan...as I recall he settled in Oregon and subsided on many things besides sunlight, including bevies of young women...
But I lived (briefly, thank God) in Boulder, Colorado during the early 80s, as you say, and at that time there was a group calling themselves The Breatharians, who supposedly were trying to live entirely “on the nutrients in the air.”
Even while I was still there the foolishness came to an abrupt end when one of the Bony Leader’s young followers found a secret refrigerator/freezer stashed with Snickers, popsicles and other decidely non-atmospheric foodstuffs...
http://en.wikipedia.org/wiki/Inedia
Article took me to this, most likely info on the Austrian documentary mentioned here in the original post.
http://en.wikipedia.org/wiki/In_the_Beginning_There_Was_Light
Info on the man who claims he went without food or water for 70 years. Even if that’s possible it appears to be a rare condition.
http://en.wikipedia.org/wiki/Inedia#Prahlad_Jani_.28.22Mataji.22.29