I can't say it's impossible, but I highly doubt any system of organs would ever learn to re-metabolize waste products and effectively avoid toxicity. When this man flexes a muscle, waste products are created. Either his body has indeed been incredibly altered by a lifetime of meditation or this is a hoax by the hospital for publicity.
the part where he was bathing gave it away, im pretty sure he got sum water out of that. His nail polish is also suspect, maybe it has nutrients that he feeds out off while sucking his thunb at night. well, there is my uneducated guess for the day loL
I kept watching related videos and one says he stares at the sun and converts the light into a sticky lump in his throat that he uses to fuel his chakra. Yay! Another excuse to stare at the sun.