if person is on low carb diet he can shifts his low carb diet on next day if he eat excess 100 carbs n next day he dont eat any carb or shift other 50

Yeah, it's kind of like sleep. You don't really shift, you just start back in. It won't take as long to reach ketosis again but you will likely fall out if you eat an extra 100 but only for s short period.

I don't know

what?