Maybe he is wondering in terms of carb cycling cause I was wondering the same thing, if u ate fats no carbs the day before you worked out in the am would that hinder your performance
Try it.
Honestly, IMHO, the presence and makeup of peri-workout nutrition trumps what you ate the day before.
Which goes back to my original premise; choose your peri well, eat whatever you want the rest of the time.
I've used tons of protocols depending on goals; CKD, TKD, carb cycling, carb nite, CBL. I've trained fed, fasted, early AM, late PM. I can tell you that, for me, the most consistently important component for recovery & strength has been peri nutrition.