I agree with Thud: not everyone does well on long-term ketosis.

Short-term ketosis over a couple of days, is okay for me; but long-term, nonstop, heavy-duty ketosis (much below 20g carbs/day for weeks on end) induces increasing depression to the point of not caring whether I live or die... a counterproductive state in every way. My brothers are the same way, so it could well be genetic.

There are many people who can't tolerate long-term ketosis without depression, so it's a good idea to keep an open mind about it being the right solution for everyone.