If I just had high caffeine tolerance I’d guess it’s either because of fast caffeine metabolism or my ADHD. Sometimes a regular cup of coffee is more than enough to wake me up and improve my ability to concentrate and sometimes not even a 4x Espresso is enough, with no discernible reason why. I have tried drinking coffee on an empty / full stomach, which doesn’t seem to make a difference. Any idea why this might happen?
Edit: Things that might matter:
- I am getting enough sleep
- I have normal body weight (BMI slightly below 24)
- I would consider my diet balanced, although I do like eating fastfood sometimes
Wow, thank you for the extensive answer. I am still wondering why my tolerance seems to vary so much, seemingly randomly. I am not on any medication. I would assume it should stay roughly the same if I don’t build a tolerance naturally by regularly drinking coffee.