Caffeine The addition of caffeine into a product is to appeal to the consumer as a stimulant. Stimulants help keep people awake and alert. However, overconsumption of caffeinated products can cause jitteriness and affect calcium metabolism. Many theories of why caffeine is an addicting stimulant point to the â€œdrugâ€™sâ€� interference with the hormone adenosine, which tells the body that it needs to sleep. Without catching up on the sleep deprived by caffeine, the human body will not function at its best in performing physically and mentally. Interestingly enough the ingredient guarana is caffeine. It is a woody vine native to Brazil and is commonly seen in energy drinks, protein bars, and weight-loss products. If caffeine and guarana are listed under the food label, it means the caffeine has two sources. Caffeine is still a stimulant and has the same effects no matter what source it came from naturally or artificially. Reid, T.R. â€œSlurped in black coffee or sipped in green tea, gulped down in a soda or knocked back in a headache pill, caffeine is the world's most popular psychoactive drug.â€� National Geographic. Web. 17 May 2011.
. An alkaloid that exists naturally in tea, kola nut and coffee; clearly toxic in high doses, can cause heart palpitations, high blood pressure, vomiting, convulsions, headache, diarrhea, frequent urination, dehydration, insomnia, stomach cramps, hand tremors, muscle twitches; acts as laxative, also saps the body's supply of calcium; used as a mild stimulant in moderation. Caffeine is the only drug that is present naturally or added to widely consumed foods (quinine is the other drug used in foods). It is mildly addictive, one possible reason that makers of soft drinks add it to their products. Many coffee drinkers experience withdrawal symptoms, such as headaches, irritability, sleepiness, and lethargy, when they stop drinking coffee. Because caffeine increases the risk of miscarriages (and possibly birth defects) and inhibits fetal growth, it should be avoided by women who are pregnant or considering becoming pregnant. It also may make it harder to get pregnant. Caffeine also keeps many people from sleeping, causes jitteriness, and affects calcium metabolism. The caffeine in a cup or two of coffee is harmless to most people. But if you drink more than a couple of cups of coffee or cans of caffeine-containing soda per day, experience symptoms noted above, are at risk of osteoporosis, or are pregnant, you should rethink your habit. Afri-Cola 100.0 (?) Jolt 71.2 Sugar-Free Mr. Pibb 58.8 Mountain Dew 55.0 (no caffeine in Canada) Diet Mountain Dew 55.0 Kick citrus 54 (36mg per 8oz can, caffeine from guarana) Mello Yellow 52.8 Surge 51.0 Tab 46.8 Battery energy drink -- 140mg/l = 46.7mg/can Coca-Cola 45.6 Diet Cola 45.6 Shasta Cola 44.4 Shasta Cherry Cola 44.4 Shasta Diet Cola 44.4 Mr. Pibb 40.8 OK Soda 40.5 Dr. Pepper 39.6 Pepsi Cola 37.2 Aspen 36.0 Diet Pepsi 35.4 RC Cola 36.0 Diet RC 36.0 Diet Rite 36.0 Canada Dry Cola 30.0 Canada Dry Diet Cola 1.2 7 Up 0 Coffee, Tea - Drip 115-175 Espresso 100mg of caffeine 1 serving (1.5-2oz) Brewed 80-135 Instant 65-100 Decaf, brewed 3-4 Decaf, instant 2-3 Tea, iced (12 ozs.) 70 Tea, brewed, imported 60 Tea, brewed, U.S. 40 Tea, instant 30 Ref: lactose.co.uk & Center of science for the public intrest (http://www.cspinet.org/reports/chemcuisine.htm#Alphabetical & www.faqs.org