User blog comment:Uknownada/Brook the only eater?/@comment-4493594-20111022082754/@comment-4493594-20111022115648

I think to say that he cannot die because he has no organs is not entirely correct. Sure, he doesn't depend on organ functions and he's immune to certain kinds of damage but on the other hand his soul is capable of imitating the function of his organs. E.g. even though he doesn't need to eat to stay alive he can obviously digest food despite lacking a stomach and it doesn't just fall through his bones either.

So perhaps his soul will imitate the "symptom", whatever you mean by that.