Uma informação que não se encontra com muita facilidade, mas que é de extrema utilidade para os viciados em cafeina, o conteúdo de cafeina (em mg) de uma série de bebidas:

Caffeine content of common beverages
Beverage Caffeine content per serving (milligrams)
Coffee
Brewed (8 ounces) 85
Instant (1 rounded teaspoon, dry) 75
Espresso (1 fluid ounce) 40
Flavored (8 ounces) 25 to 75
Decaffeinated, brewed (8 ounces) 3
Decaffeinated, instant (8 ounces) 3
Tea (8 ounces)
Black tea 40
Green tea 40
Decaffeinated black tea 4
Iced tea, ready to drink 30
Iced tea mix, unsweetened 13
Carbonated beverages (12 fluid ounces)
Coca-Cola Classic, Cherry Coca-Cola 34
Diet Coke 45
Barq’s Root Beer 22
Mello Yellow (regular and diet) 51
Pepsi-Cola, Wild Cherry Pepsi 38
Diet Pepsi-Cola 36
Sunkist Orange Soda 41
Surge 51
Red Flash 40
Mountain Dew (regular and diet) 55
Code Red Mt. Dew 53
Royal Crown Edge 70
Other beverages
Cocoa (5 ounces) 5
Planet Java Caramocha (9.5 ounces) 65
Planet Java Javadelic (9.5 ounces) 65
Planet Java Tremble (9.5 ounces) 129
KMX Orange, KMX Blue (8.4 ounces) 38
SoBe Adrenaline Rush (8.3 ounces) 79
SoBe No Fear (8 ounces) 158
Red Bull (8.5 ounces) 80

Sources: National Soft Drink Association (2003), www.nsda.org;
SoBe Beverages (2003); American Dietetic Association (2003)

Retirado de MayoClinic.com - Medical and health information for a healthier life from Mayo Clinic