Everyone's different.

I lose energy if I do have breakfast. Which results in lack of focus. Therefore I often postpone my breakfast as long as I possibly can, otherwise, with a large probability, my work day is ruined before it even starts.

Agree, breakfast slows me down, so I rarely eat it anymore and typically eat around midday to 1pm after morning work and exercise. I've fasted only once, it lasted 12 days and my energy level was almost overwhelming and electric. Boxing, running, etc. I gave up trying to understand why. And although it was an amazing experience, have not fasted again in the 5 years since.

For myself, I have low energy if I don't eat breakfast, but there is essentially no hunger signal for me in the morning. Over time I've settled on eating the plainest breakfast I can.

I think this has a lot to do with the 9–5 and my natural sleep cycle being delayed compared to that.

Same. If I have breakfast it seems to kickstart my metabolism or something idk. The result is, if I have breakfast, I’m distracted by hunger all morning. If I skip breakfast I can focus all morning and I don’t get hungry until lunchtime. Bodies are weird.