No and Yes
The body simply replenishes it energy stores
i.e. glycogen stores and then fat.
And it does the reverse when utilising it.
It doesn’t turn on a special switch after fasting to say - I’m going to change the way I do this from now on.
I’ve also read ‘somewhere’ the same text - but I can only see this in context of metabolic rate. i.e. Once the body has been starved excessively (beyond most intermittent fasting regimes) the metabolic rate slows and using up stores next time becomes a slower process.
Indeed, if switching on fat storage happened every time someone fasted they would see more being stored until the loss stopped altogether - which just doesn’t seem to be the case.
Fat loss with IF (or any restriction or diet) only appears to slow as body fat percentage falls to low levels. Quite understandable if there is much less of a particular fuel to metabolise.
And Yes, to the well balanced diet - and that a well balanced diet should include a well timed consumption. IF may provide a way to make that well balanced diet even more effective.
It does seem to change the way the body uses fuel and repairs itself and (n=1) I can see and feel the fat disappearing from under my skin as the weeks progress in a way I haven’t before, without having to weigh and count every last calorie.
All in all - each to their own.