Do you think we make ketones for several weeks without using them…?
The effect was sudden in my case and mostly affected my hunger and satiation. My energy and thinking never changed except I actually get up in the morning on keto (if I have an alarm, at least), I didn’t need fat adaptation for that and it’s not enough, I need to be in ketosis.
I never had keto flu or bad days on keto. Okay, sometimes I feel less great, I am a human, after all but no big problems and not because of keto.
If my changed hunger and satiation is the sure sign of my fat adaptation, I don’t think it ever can go away. I have a hypothesis that longer term high-carb will ruin it (I started to feel my old hunger coming back when I ate too much carbs for too long) but I never will go back to high-carb. A high-carb day or two surely couldn’t take the changes away. Or some higher-carb months (still low-carb). No idea what exactly happens in my body though… I just have the signs and symptoms. The happenings inside me obviously can’t be that sudden and simple.
And my hunger and satiation continued to change, I got fat adapted years ago and I feel differently, both in ketosis and out of it. So even for me, it’s not a switch, it evolves. Maybe it’s not my fat adaptation, OMAD had a serious effect too but things definitely change as I get farther and farther from my old carby days.