Talk:Ghoul/@comment-27592959-20160120174328/@comment-27204325-20160120190759

The fact that they only have two food sources, and mimic the appearance and behavior of their prey seems to lend some more evidence to a parasitic or simply opportunistic predatory nature.

But one issue is that we can't say that RC Cells compel a ghoul to consume more RC Cells for the sake of increasing the concentration, because it doesn't seem like that's the case. Ghoul's prefer not to cannibalize, don't find other ghouls palatable, and for the most part won't develop a kakuja. And even the ghouls that will aren't drawn to it at a fundamental level, it's always a result of environmental factors. In a vacuum their feeding habits are extremely efficient and regular, so it's not like we can point to outliers like Kaneki and Eto as examples of an ideal state. From what we've seen, an ideal example would be more like Nishiki, who blended in perfectly, hunted carefully, at a stable pace, and avoided much unnecessary risk.