Quick Quiz

Which of the following plants contains the most caffeine?
a) Robusta coffee beans
b) Arabica coffee beans
c) Cocoa nuts
d) Tea leaves

Answer: d) Tea leaves - Tea leaves can have caffeine content as high as 5%. Robusta coffee beans contain about 2% and Arabica coffee beans about 1%. Cocoa nuts contain 0.2 to 0.4% caffeine. However because of the way these various drinks are brewed, the amount of caffeine in the actual drink can be very different.
Percolated or drip coffee has a typical caffeine content of 100 to 150 mg per 150 ml. An espresso comes in at 90mg; tea varies greatly between 30 to 100 mg.