These 2 Australian doctors put it better than I can.
There is much confusion about these two concepts so let’s discuss these and do some myth-busting. In this article, Dr Lucy discusses what is ketosis, how to know if you are in ketosis, what is ketoacidosis, what is fat-adaptation, how to know if you are fat-adapted and taking exogenous ketones.
www.rlmedicine.com
Basically once your metabolism is fixed, you only want the nutrition you need, not the huge amounts of carby stuff we've been told to eat for years.
I didn't believe it either, when first reading about it but 3 years in I'm fitter slimmer healthier and eat much less and rarely feel hungry.
Give it time, trust your meter and your body will tell you what it needs