Curious how your journey will go. I chose to ultimately forego breakfast, and those first few weeks it was like my body was trying to kill me, almost kicking drug addiction. After a week I could sense when my body ran out of sugar, because my stomach would begin churning and my mind kept telling me to eat some carbs or sugar.

In the end that feeling eventually wore off, and now I don't even think about breakfast anymore. You could do caffeine, but just remember caffeine could be a wild ride on an empty stomach if you aren't accustomed to it.