Do whatever works for youBruh back in the stone age humans might not even eat at all for a whole day, let alone get a nice breakfast every morning. Running on empty is fine. My best cardio sessions are fasted Now lifting fasted But just going to work or doing cardio.... it's not that serious.
You are talking a bunch of bro science.... give it a try before you knock it. Not for a day, for like a week or two. I promise u won't die