If you are someone who feels tired after drinking coffee, then this is where you can find the answers why! Read on to know.

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In general, those with variations affecting the genes – namely CYP1A2 and a gene that regulates it, called AHR – tend to break caffeine down more slowly, allowing it to remain in the blood longer. Yet ...

He explained that people tend to be either fast or slow metabolisers of caffeine ― which one we get depends on which type of liver enzyme, known as CYP1A2, we have. The enzyme affects how ...