I used to be a heavy coffee drinker.
Then while on a long run(10 mi +)I had breathing difficulty.
Then more of the same and the next day too...
My Doc is an internist/cardiologist, puts me on a treadmill. I planed to smoke the treadmill! I never knew they went on that much of an incline!
After about 30 minutes, all the many screens are blinking ARRHYTHMIA...ARRHYTHMIA...ARRHYTHMIA...
The nurse looks worried, I feel fine. My doc asked if I can continue until the breathing issue occurs.
A few minutes and it happens.
The doc hits the shut down button and before the platform drops to level, he asks “how much coffee do you drink”
He said it was the classic symptoms of excess caffeine and only affects about 15% of over users.
Now only two cups each AM; A-OK.
Great story, thanks for sharing. It must be relieving to know your caffeine limit.