Chocolate thickens the saliva, which isn't good news if you've gotta recite Shakespeare or sing Iron Man. Having said that, you're not supposed to drink tea either but I still do before gigs. It's not very rock and roll, but it's like a magic potion to me.
I abused my body so much throughout my career that I am literally held together by glue. The stuff I took thickens the bones and reinforces the tendons.
Being slagged off is good for you. It thickens the skin and strengthens the backbone.
But I know what darkness is, it accumulates, thickens, then suddenly bursts and drowns everything.