One of the most studied ingredients
Caffeine is a comprehensively studied ingredient in the food supply, with centuries of safe use. Regulatory agencies throughout the world including Food Standards Australia New Zealand (FSANZ), Food and Drug Administration in the US (FDA) and the UK's Food Standards Agency (FSA), consider the appropriate use of caffeine in food to be safe and acceptable.
Pregnant or nursing women, or women trying to become pregnant, should consult a doctor regarding caffeine consumption.
Caffeine in the diet
The most commonly known sources of caffeine are coffee, cocoa beans, and tea leaves. Caffeine is also an ingredient in sparkling cola beverages and other drinks. Caffeine levels in popular products are as follows:
|Pack Size(mL)||'Coca-Cola'||'Diet Coke'||'Coke Zero'||Instant Coffee
*brewed from leaf or tea bag Source for instant coffee and tea information: AUSNUT 2010, FSANZ
Caffeine in sparkling drinks
The amount of caffeine in our cola soft drinks is relatively small, 9.6 - 12.8 milligrams of caffeine per 100ml serving or 24 - 32mg per 250mL cup, less caffeine than a cup of instant coffee (which is approximately 77.5mg per 250mL cup). However, because some people prefer drinks without caffeine, many sparkling drinks are also available in caffeine-free versions.
Is caffeine dehydrating?
Scientific consensus concludes caffeinated beverages contribute to the body's hydration needs similarly to non-caffeinated beverages. The US based Food and Nutrition Board of the Institute of Medicine in its February 2004 report on 'Dietary Reference Intakes for Water, Potassium, Sodium, Chloride and Sulfate*' states, "... caffeinated beverages appear to contribute to the daily total water intake similar to that contributed by Non-Caffeinated beverages."
In a study examining the effect of caffeinated and non-caffeinated beverages on hydration status, no significant differences were found in the effect of various combinations (Grandjean, A et. al. The Effect of Caffeinated, Non-Caffeinated, Caloric and Non-Caloric beverages on Hydration, J. Am. College of Nutrition, 2000. 19, 591-600).
In addition a review on hydration concluded that moderate ingestion of caffeine (<300mg) does not promote dehydration (Ganio MS, et. al. Evidence-Based Approach to Lingering Hydration Questions, Clin. Sports. Med. 2007, 26, 1-16.
* Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. National Academy of Sciences. Institute of Medicine. Food and Nutrition Board, 2004. 4; 133-134