Who knows how true that is. One can argue that if have the mindset to eat other humans, you are already in a degenerative state.
You bring up a very good point, though I personally believe that's dependent on how a person is brought up. In a technologically advanced civilization such as our own, we feel that it would be an illness to begin with, however with tribal instincts of certain geographical groups (let's say, amazonian tribes), it may be a normal thing to believe that gaining power through eating another human to gain their own strengths.
Either way, I would rather not be subjected to an incurable disease. I'll stick with bacon.