Genetic polymorphism of the adenosine A2A receptor is associated with habitual caffeine consumption
What if you have already built up a tolerance due to
habitual caffeine consumption?
Associations between polymorphisms in the AHR and CYP1A1 - CYP1A2 gene regions and habitual caffeine consumption
However, with
habitual caffeine consumption, the affectedness of caffeine is greatly reduced.
In the chart showing the effects of Green Tea — how does Race / Ethnicity,
Habitual Caffeine Consumption and COMT Activity — play a role?