This is from a interview with someone at Sony that Michael trusted.
CR: “This was years ago. I’m going to go back probably eight years ago and Michael told me, ‘Cory, I can’t tour anymore. I’m not gonna tour anymore. Ok?’ I said, ‘why Mike?’ He said, ‘Because it will kill me.’ That’s what he said to me. He said, ‘It will kill me.’ Why would you say something like that? He said, ‘Well, remember when I was preparing for my concert and I passed out at the Sony Studio?’ He said, ‘Well, it’s because when I get ready for a tour I get dehydrated. I don’t eat. I don’t drink. I don’t sleep. I put so much of myself into preparing for a tour.’
He said, ‘I’m not doing it on purpose. This is just something I don’t think about anymore. You understand? I’ve just become so driven that I can’t even think about these things anymore. They made me walk around with an IV last time. He said, ‘So I just decided, my doctors decided that maybe you shouldn’t do this anymore. He said he wanted to make the Invincible album work to the point where that was it. He’s done with the tour. He’s gonna do this Invincible album. He wanted to continue to put out albums. He said, ‘I’ll do albums till I can’t do it anymore, but I just can’t tour.’”