This could be why ๐
Caffeine is metabolized in the liver, but not everyone metabolizes it at the same speed.
This depends largely on the activity of a certain enzyme (called CYP1A2).
Depending on the activity of this enzyme, you could be a slow metabolizer or a fast metabolizer of caffeine.
Slow metabolizers feel the effects of caffeine more intenselyโwith jitters, nervousness, restlessness, racing heart, or trouble sleeping.
Fast metabolizers donโt.
๐งฌ This is based on genetics!
The best thing to do is to know your limits and not buy into the caffeine culture if it doesnโt work for you โ