It would be irresponsible not to speculate.Here at the Riddled School of Alternative Ethics we are familiar with the concept of human photosynthesis, but Elisabeth Bik has encountered a version of that concept which reaches new levels of I-can't-even. The Human Photosynthesis Study Center is the source of at least 56 papers addressing the implications for well-being, cancer and Alzheimer's Disease of "the amazing ability of the human body to transform the visible and invisible light energy into chemical free energy through dissociation and re-formed from the water molecule".
Evidently“Human being begin to lose the capacity to split the water molecule at 26 years old, ca. 10 % each decade, and after fifties goes into free fall” My own capacity reached terminal velocity a long time ago.
Go read the whole thing, as they say. I shall stay here and admire Figure 4, from which we learn that "The mesencephalon is entirely imbued by the energy that coming from melanin, night and day; all the life; and can be schematized as hereby above. Note that energy coming from both sides".
Either that, or it's Saruman clutching his Palantír while made up as the worst clown EVAH.