Weight / Fat loss

Ketosis is when you have no liver glycogen apparently (Checking on wikipedia..) so either after bonking, or starvation. You'll be burning fat whatever you do, just in different proportions with glycogen stores depending on available oxygen from the blood.

I think.

Not necessarily. Overconsumption of "rich" (fatty) foods will also lead to it, i.e., gout. But I'm sure you have to do some pretty crap stuff or have a genetic predisposition to it to get it young. I think what I was mentioning early, cos I always go off half-cocked, is that it seems to me that if you eliminate carbs and eat a high-fat diet, this would likely lead to this sort of problem. But then, I shouldn't talk about things I'm not 100% sure on. THis is just stuff half-remembered from school 6 years ago.