I'm wondering once you are in Ketosis, what is the fuel used to produce the ketones: stored body fat or the fat I eat in the meals? Or both?
I have seen a video by science research program BBC Horizon that say ketosis doesn't actually make you lose weight. You can watch it at https://youtu.be/NfsWuvh3eAY?t=28m20s
It answers the question with the answer ketosis is a placebo.