I heard of a person whose cartilage was damaged. I thought this is something that can be fixed by surgery, but apparently it isn't. So it's quite a serious thing, as there's no way back. The only thing they can do is prevent it from getting more damaged. In the case of this person he's getting all kinds of additives to his food and it's really needed, because some movements that are normal for most people cause him a lot of pain. I don't know if he could have done anything to prevent it and of course that is always hard to say. I just wonder if, in case he would have taken the additives before, it would have helped.