Maybe I'm missing something....or its just really late, I'm not sure, but my understanding is that while in ketosis your body is using fat for energy whether it be from food or fat stores. I've also read that while you are in ketosis you don't produce insulin which causes calories to be stored as fat. At the end of the day weight loss is all about having a calorie deficit......calories in - calories burned = calories deficit ie weightloss.

So assuming someone takes in wayyyyyy more calories then they burn yet they are in ketosis, how is it that fat is still stored. Does insulin restart at some point even with a lack of carbs.