I don't see that he had what we would normally classify as a mental disorder. He had a physical disorder which required him to eat constantly, and the quantities of food he required were not easily available, leading him down a dark path where he ate anything and everything. His survival instinct caused him to eat live animals because he was in such a state he did not have time to kill and cook them and realized it did not matter to his body. I guess at some point his instinct was so strong that he stopped seeing animals (including humans) as beings and simply as food to keep him alive. It's fascinatingly morbid.
Yes, exactly. I'm a type 1 diabetic, and episodes of hypoglycemia can cause a survival instinct to eat, and it's possible to lose all sense of rationality in those moments. But nobody would say I have a mental illness after one of those episodes. It's a physical disorder that may or may not have an accompanying mental disorder.
> I guess at some point his instinct was so strong that he stopped seeing animals (including humans) as beings and simply as food to keep him alive.
I think perhaps that would be a mental disorder. If not then, at least now. It might have been caused by real life physical issues, but aren't they often?