[embwbam]

For anyone else who discovers they are a fast metabolizer of coffee: try eating a big breakfast before drinking coffee to slow absorption.

I wanted to be a coffee drinker for YEARS, but it made me really high, and I felt super tired later in the day. I don't know why I didn't connect the dots until I searched my genome, but once you know whether you are a fast or slow metabolizer you can play all sorts of games. I can now drink coffee before dinner, and the crash hits right at bedtime.

[BeFlatXIII]

For me, I found the secret was eating anything other than cereal (or egg & toast) for breakfast. Those seem to make me jittery. Eating something like yesterday's dinner leftovers for breakfast turns the coffee into an on switch instead of leaving me exhausted but adding jitters and sleeplessness.