The Buzz on Caffeine
Dennis Newhook, RMT, CYT
Caffeine occurs naturally in many plants, including familiar sources such as coffee beans, the tea leaf, and the cocoa bean from which chocolate is made. Cola beverages also contain caffeine, both from the kola nut and (the majority) from supplemental caffeine (often taken from coffee beans which have been decaffeinated). Another common source is over-the-counter drugs such as cold remedies, pain relievers, and weight-loss aids.
While caffeine is generally recognized as safe, Health Canada does recommend a maximum daily intake of 400 mg. For adolescents and children, the amount is much less: 45 mg for children aged four to six; 62.5 mg for children aged seven to nine; 85 mg for children aged 10 to 12. Adolescents 13 and older, should follow the precautionary recommendations of 2.5 mg of caffeine per every kg of body weight.
Some health advocates have tried to link caffeine to negative health effects, but so far, most studies are inconclusive. What we do know is that everybody has a different tolerance for caffeine. In healthy adults, a small amount of caffeine has positive effects (increased alertness and concentration). For caffeine-sensitive adults however, even small doses cause insomnia, headache, irritability and nervousness. Children are at increased risks of experiencing these effects. Other effects of excess caffeine include muscle tremors, nausea, increased heart rate and blood pressure, and anxiety.
There appears to be a growing market for specialty formulated energy drinks. These often have very high amounts of caffeine and sugar, as well as other energy-boosting herbal ingredients. Labelling regulations require caffeine content be listed only when pure caffeine is added to a beverage. Extra caffeine from plant additives may not be reflected in the label. These energy drinks are NOT recommended for children, pregnant or breastfeeding women, or caffeine-sensitive people.
Some over-the-counter medications contain as much as 1000 mg of caffeine in a daily dose! Be sure to include that amount in your daily caffeine allowance. If you take caffeine daily, be sure to ask a medical professional if caffeine consumption could interact with any other medications you might be taking. So enjoy your daily java if you choose, but stay informed!
(Health Canada, Whitney & Rolfes: Understanding Nutrition)