Table 1. Sources of caffeine in the diet.

Sources of caffeine	Mean concentration
Espresso	60 mg/30 mL
Decaffeinated coffee	3 mg/125 mL
Filtered coffee	85 mg/125 mL
Instant coffee	65 mg/125 mL
Tea (leaves or bag)	32 mg/150 mL
Iced tea	20 mg/330 mL
Caffeinated soft drinks	39 mg/330 mL
Sugar-free soft drinks	41 mg/330 mL
Energy drinks	80 mg/330 mL
Hot chocolate	4 mg/150 mL
Chocolate bar	20 mg/30 g
Dark chocolate	60 mg/30 g
Milk chocolate	6 mg/30 g