Did Sauron lose because he didn't give his orcs vitamins?
We all like to believe that, at least in fantasy fiction, the good characters win out because they are... well, good. But maybe there is another, simpler, explanation. Maybe it's because the evil characters are weakened by a deficiency in vitamin D, which our bodies make when exposed to sunlight. Good thing there weren't multivitamins in Middle Earth.
The hobbit - an unexpected deficiency.
"OBJECTIVE: Vitamin D has been proposed to have beneficial effects in a wide range of contexts. W