Caffeine is a natural stimulant found in coffee, tea and certain other substances, such as chocolate and yerba mate. Caffeine is also added to some foods, drinks and medications, notably colas like Coke and Pepsi.
The levels of caffeine vary from drink to drink and food to food. You can get an idea of how much caffeine you're consuming by looking up your favorite drinks in this listing of caffeine levels in coffee, tea, cola and other drinks (or, if you're a loyal Starbucks customer, this list of Starbucks' drinks caffeine contents). Knowing how much caffeine you're taking in may be especially useful if you're suffering from symptoms of excess caffeine consumption.
The down side of estimated levels of caffeine in coffee and tea is that these are merely estimates. There are many variables that determine how much caffeine is in your mug of coffee or your teacup. However, these variables illuminate some of what makes coffee and tea so fascinating -- the same innumerable variations in growing conditions, plant material, processing and brewing that create their enormous breadths of aroma and flavor. You can learn more about these variations with my guides to factors influencing caffeine levels in coffee and factors influencing caffeine levels in tea.
Photo (c) Lindsey Goodwin
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