Caffeine Content in Coffee and Other Drinks. We mentioned in our post on coffee side effects that you should not drink more than 4 mugs of coffee a day. We also mentioned that a mug of brewed coffee contains 140 milligrams (mg) of caffeine while a mug of instant coffee has 100mg of caffeine.
Now, those of you who are curious about the caffeine content in common drinks such as Coca Cola and Mountain Dew will be happy to know that the University of Washington has released a guide that shows the caffeine content in common drinks and foods.
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