No idea.

But: one week after making a "massive and radical change in diet that leads to a massive and radical change in the body" -- meaning, BEFORE they've had any time to adapt (and I'm sure that study chose that moment on purpose!) -- "there were differences found" (I'd like to know the detail of that measure). If there were no physical chaos going on during the induction phase it wouldn't be the induction phase/detox.

I bet if you suddenly quit smoking or drinking or something else that really shifts your body and starts mega-venting toxins, fluid etc., there'd be similar results. So should nobody quit smoking or drinking because a week into the detox they're showing the venting signs in some way?

Anyway, it never happened that way for me. Going lowcarb significantly cleaned up my "brain fog". So studies like this always just make me confused. Maybe some people have that reaction to VVLC initially but certainly not all.