Caffeine

High-Protein Diet Slideshow

Author: Betty Kovacs, MS, RD
Medical Editor: Melissa Conrad Stöppler, MD

• What is caffeine?
• What are the sources of caffeine?
• Is caffeine addictive?
• Is caffeine a diuretic?
• Does caffeine cause heart disease?
• Does caffeine cause bone loss?
• Does caffeine help with weight loss?
• Is caffeine safe during pregnancy?
• Should caffeine be consumed by children?
• How much fluid do we need?

What is caffeine?

There are few people who are not aware of the stimulating effect that caffeine provides. We have a choice and choose caffeinated beverages for a reason. Caffeine is considered the most commonly used psychoactive drug in the world. Approximately 80% of the world's population consumes it on a daily basis, and continuous research is being done on its health benefits and consequences.

Caffeine is the common name for 1,3,7-trimethylxanthine. When purified, caffeine produces an intensely bitter white powder that provides a distinctive taste in soft drinks. The word "caffeine" came from the German word kaffee and the French word café, each meaning coffee. After ingesting caffeine, it is completely absorbed within 30 to 45 minutes, and its effects substantially diminish within about three hours. It is eventually excreted so there is no accumulation in the body. Caffeine has been shown to affect mood, stamina, the cerebral vascular system, and gastric and colonic activity. But caffeine may not be for everyone. This article will discuss the health benefits and consequences of caffeine.

What are the sources of caffeine?

Caffeine is naturally found in certain leaves, seeds, and fruits of over 60 plants worldwide. The most common sources in our diet are coffee, tea leaves, cocoa beans, cola, and energy drinks. Caffeine can also be produced synthetically and added to food, beverages, supplements, and medications. Product labels are required to list caffeine in the ingredients but are not required to list the actual amounts of the substance. A low to moderate intake is 130 to 300 mg of caffeine per day, while heavy caffeine consumption corresponds to more than 6,000 mg/day. It is estimated that the average daily caffeine consumption among Americans is about 280 mg/day, while 20% to 30% consume more than 600 mg daily. The caffeine content in some common sources of caffeine are listed below:

There are many products that may contain caffeine without your awareness. Be sure to read the label to see if caffeine is listed among the ingredients.