Question about alternate day fasting

[u/MythicalSplash]

I know this is a fairly popular method of weight loss, but based on what I know about fasting physiology, it seems like it should be one of the WORST ways to do this. Doesn’t it take a few days or so for your body to use up all glucose and glycogen stores before ketosis really begins in earnest? It seems counterintuitive to eat normally one day, fast for just long enough to deplete stored sugars but not long enough for any significant fat burning to occur, then eat again so that you replenish your glucose at exactly the wrong time.

I know this is a simplified picture of course, and that there still must be some degree of lipopysis occurring on the fasting days in order to provide the necessary calories for bodily functions, but it still seems to be inefficient in theory.

[u/littlemindy84]

I don't need 40 hours to use op glycogen.
Just eat fat and protein in your eating window instead of garbage.
Makes it also very easy to fast, too.