Caffeine is the most widely used drug in the world and can be helpful or harmful, depending on how it’s used. Caffeine provides a “lift” by blocking the normal action of adenosine. Adenosine normally slows down your brain’s activity and induces sleepiness. Some people are caffeine sensitive and don’t tolerate it well, or have problems sleeping if they have caffeine too late in the day.
Caffeine levels vary depending on type of bean, roast, grind, and brewing method. Contrary to popular belief, darker roasts typically contain less caffeine than lighter roasts due to the prolonged heat breaking down more of the caffeine molecules. Bean species also differ widely in their naturally occurring concentrations of caffeine. Additionally, drip coffee actually has more caffeine than espresso because the brew time is much longer. And in general, the finer the grind, the higher the caffeine in the coffee. So, you might want to vary some of these factors if you experience a reaction, like switching from drip coffee to espresso, or changing brands.
If you have an issue with decreased adrenal function, use coffee with care, as it can be hard on your adrenal glands. Coffee also has a
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