Caffeine in the Diet

Caffeine occurs naturally in many plants, including coffee beans, tea leaves and cocoa nuts. It is therefore found in a wide range of food products. Caffeine is added artificially to many others, including a variety of beverages. Here are the most common sources of caffeine for Americans:

• Typical drip-brewed coffee contains 100 mg per 6-ounce cup. If you are buying your coffee at Starbucks or a convenience store or drinking it at home or the office out of a mug or a commuter's cup, you are consuming it in 12-, 14- or 20-ounce containers. You can calculate the number of milligrams based on your normal serving size.

• Typical brewed tea contains 70 mg per 6-ounce cup.

• Typical colas (Coke, Pepsi, Mountain Dew, etc.) contain 50 mg per 12-ounce can. Things like Jolt contain 70 mg per 12-ounce can.

• Typical milk chocolate contains 6 mg per ounce.

• Anacin contains 32 mg per tablet. No-doz contains 100 mg per tablet. Vivarin and Dexatrim contain 200 mg per tablet.

By looking at these numbers and by knowing how widespread coffee, tea and cola are in our society, you can see why half of all American adults consume more than 300 mg of caffeine per day. Two mugs of coffee or a mug of coffee and a couple of Cokes during the day are all you need to get you there. If you sit down and calculate your caffeine consumption during a typical day, you may be surprised. Many people consume a gram or more every single day and don't even realize it.