[throwaway12309]

Just as a counter point, for me was the opposite. Skipping breakfast was what made me be more focused.

I remember since I was a kid, I hated eating breakfast (no matter which type: eggs or sugar ridden cereals, it was the same) and growing up, I always had trouble focusing in the morning. It was only when I started to skip breakfast and have lunch at around 1-2pm did my focus and attention improved.

Long story short, different strokes for different folks ;)